PassimPay API

https://passimpay.gitbook.io/passimpay-api
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### C# PassimPay API client example

Source: https://passimpay.gitbook.io/passimpay-api/integration-examples/signature-and-api-client.md

C# example of a PassimPay client that reads platform ID and API key from environment variables, reads request fields from a JSON file, and posts a request. It prints the result or an error message and returns exit code 0 or 1.

```csharp
public static class Program
{
    public static async Task<int> Main(string[] args)
    {
        try {
            if (args.Length != 2) throw new ArgumentException("Invalid arguments");
            using var client = new PassimPay(int.Parse(Environment.GetEnvironmentVariable("PASSIMPAY_PLATFORM_ID")!),
                Environment.GetEnvironmentVariable("PASSIMPAY_API_KEY")!);
            var fields = JsonNode.Parse(await File.ReadAllTextAsync(args[1]))!.AsObject();
            var result = await client.PostAsync(args[0], fields);
            Console.WriteLine("PassimPay request result=" + result["result"]!.GetValue<int>());
            return 0;
        } catch (Exception) {
            Console.Error.WriteLine("PassimPay request failed; check configuration and reconcile before retrying");
            return 1;
        }
    }
}
```

--------------------------------

### Successful response (200) example

Source: https://passimpay.gitbook.io/passimpay-api/fiat/supported-currencies

Example response showing a subset of returned currencies. The response includes a list of currency objects with fields id, name, sign, currency, and rateUsd. Exchange rates may change.

```json
{
  "list": [
    {
      "id": 1,
      "name": "United States Dollar",
      "sign": "$",
      "currency": "USD",
      "rateUsd": "1"
    },
    {
      "id": 10,
      "name": "Euro",
      "sign": "€",
      "currency": "EUR",
      "rateUsd": "0.877381"
    }
  ],
  "result": 1
}
```

--------------------------------

### Signature Verification Example (PHP)

Source: https://passimpay.gitbook.io/passimpay-api/webhook-1.md

PHP example of verifying the HMAC-SHA256 signature for the withdraw webhook. It shows how to generate the signature contract and compare it with the 'x-signature' header.

```APIDOC
## Signature Verification Example (PHP)

### Description
PHP example of verifying the HMAC-SHA256 signature for the withdraw webhook. It shows how to generate the signature contract and compare it with the 'x-signature' header.

### Code
```php
<?php
// Retrieve the raw JSON body from the request
$json = file_get_contents('php://input');
$body = json_decode($json, true);

// Sort the body
$sortedBody = json_encode($body);

// Platform and secret keys (example placeholders)
$platformId = 'your-platform-id';
$secret = 'your-api-key';

// Generate the signature contract string
$signatureContract = $platformId . ";" . $sortedBody . ";" . $secret;

// Generate HMAC-SHA256 signature
$signature = hash_hmac('sha256', $signatureContract, $secret);

// Retrieve the request headers
$headers = getallheaders();

// Get the signature from the headers
$receivedSignature = $headers['x-signature'] ?? '';

// Compare the generated signature with the received signature
if ($signature === $receivedSignature) {
    echo 'Signature is valid';
    // Proceed with further processing
} else {
    echo 'Invalid signature';
    // Handle the error accordingly
}
```
```

--------------------------------

### Signature Verification Example (Java)

Source: https://passimpay.gitbook.io/passimpay-api/webhook-1.md

Java example of verifying the HMAC-SHA256 signature for the withdraw webhook. It shows how to generate the signature contract and compare it with the 'x-signature' header.

```APIDOC
## Signature Verification Example (Java)

### Description
Java example of verifying the HMAC-SHA256 signature for the withdraw webhook. It shows how to generate the signature contract and compare it with the 'x-signature' header.

### Code
```java
@RestController
public class SignatureVerificationController {

    private static final String PLATFORM_ID = "your-platform-id";
    private static final String SECRET = "your-api-key";

    // Helper function to generate HMAC-SHA256 signature
    private String generateSignature(String signatureContract, String secret) throws NoSuchAlgorithmException, InvalidKeyException {
        Mac sha256HMAC = Mac.getInstance("HmacSHA256");
        SecretKeySpec secretKey = new SecretKeySpec(secret.getBytes(StandardCharsets.UTF_8), "HmacSHA256");
        sha256HMAC.init(secretKey);
        byte[] hash = sha256HMAC.doFinal(signatureContract.getBytes(StandardCharsets.UTF_8));
        StringBuilder result = new StringBuilder();
        for (byte b : hash) {
            result.append(String.format("%02x", b));
        }
        return result.toString();
    }

   // Platform notification URL
    @PostMapping("/notification")
    public ResponseEntity<String> notificationWebHook(@RequestBody Map<String, Object> body, @RequestHeader HttpHeaders headers) throws NoSuchAlgorithmException, InvalidKeyException, JsonProcessingException {
        // Signature Verification
        ObjectMapper objectMapper = new ObjectMapper();
        String sortedBodyJson = objectMapper.writeValueAsString(body);

        // Generate the signature contract string
        String signatureContract = PLATFORM_ID + ";" + sortedBodyJson + ";" + SECRET;

        // Generate HMAC-SHA256 signature
        String signature = generateSignature(signatureContract, SECRET);

        // Get the signature from the headers
        String receivedSignature = headers.getFirst("x-signature");

        // Compare the generated signature with the received signature
        if (StringUtils.hasText(receivedSignature) && signature.equals(receivedSignature)) {
            return ResponseEntity.ok("Signature is valid");
        } else {
            return ResponseEntity.status(400).body("Invalid signature");
        }
    }
}
```
```

--------------------------------

### Go: POST /v2/currencies and /v2/balance

Source: https://passimpay.gitbook.io/passimpay-api/integration-examples/currencies-and-balance.md

Uses the shared signed client to POST empty fields to /v2/currencies and /v2/balance, printing the result. Requires the shared client from the signature and API client example.

```go
fields1 := map[string]any{

}
result1, err := client.Post("/v2/currencies", fields1)
if err != nil { return err }
fmt.Printf("PassimPay request result=%v\n", result1["result"])

fields2 := map[string]any{

}
result2, err := client.Post("/v2/balance", fields2)
if err != nil { return err }
fmt.Printf("PassimPay request result=%v\n", result2["result"])

```

--------------------------------

### Signature Verification Example (Python)

Source: https://passimpay.gitbook.io/passimpay-api/webhook-1.md

Python example of verifying the HMAC-SHA256 signature for the withdraw webhook. It shows how to generate the signature contract and compare it with the 'x-signature' header.

```APIDOC
## Signature Verification Example (Python)

### Description
Python example of verifying the HMAC-SHA256 signature for the withdraw webhook. It shows how to generate the signature contract and compare it with the 'x-signature' header.

### Code
```python
body = request.get_json()

# Platform and secret keys (example placeholders)
platform_id = 'your-platform-id'
secret = 'your-api-key'

# Generate the signature contract string
signature_contract = f'{platform_id};{body};{secret}'

# Generate HMAC-SHA256 signature
signature = hmac.new(secret.encode(), signature_contract.encode(), hashlib.sha256).hexdigest()

# Get the signature from the headers
received_signature = request.headers.get('x-signature', '')

# Compare the generated signature with the received signature
if signature == received_signature:
    return 'Signature is valid', 200
else:
    return 'Invalid signature', 400
```
```

--------------------------------

### Request example: curl https://api.passimpay.io/v2/fiats

Source: https://passimpay.gitbook.io/passimpay-api/fiat/supported-currencies

Use this curl command to retrieve the list of supported fiat currencies. No authentication or request parameters are required.

```bash
curl https://api.passimpay.io/v2/fiats
```

--------------------------------

### Python: POST /v2/currencies and /v2/balance

Source: https://passimpay.gitbook.io/passimpay-api/integration-examples/currencies-and-balance.md

Uses the shared signed client to POST empty dicts to /v2/currencies and /v2/balance, printing the result. Requires the shared client from the signature and API client example.

```python
fields1 = {}
result1 = client.post("/v2/currencies", fields1)
print("PassimPay request result=", result1["result"])

fields2 = {}
result2 = client.post("/v2/balance", fields2)
print("PassimPay request result=", result2["result"])

```

--------------------------------

### Calling record_verified_deposit after verification

Source: https://passimpay.gitbook.io/passimpay-api/integration-examples/webhooks-and-payment-accounting.md

Initializes the database and calls record_verified_deposit with a two-confirmation policy for a BTC example. Must be called after IP and signature verification and loading the saved order. Outcomes are durably stored.

```python
from deposit_store import init_database, record_verified_deposit

init_database("payments.sqlite3")  # Use a schema migration in production.
outcome = record_verified_deposit(
    "payments.sqlite3", event,
    platform_id=platform_id,
    expected_order_id=order["orderId"],
    expected_payment_id=order["paymentId"],
    expected_address=order["address"],
    expected_tag=order.get("destinationTag"),
    minimum_confirmations=2,
)
# After return, pending, credited and duplicate outcomes are durably stored.
```

--------------------------------

### Create Withdrawal (C#)

Source: https://passimpay.gitbook.io/passimpay-api/integration-examples/cryptocurrency-withdrawals.md

C# example that creates a withdrawal via /v2/withdraw. It uses the shared client and requires a valid recipient address and local order ID. Replace the placeholder BTC address before sending.

```csharp
var fields1 = JsonNode.Parse("""
{
  "paymentId": 10,
  "orderId": "payout-1001",
  "addressTo": "REPLACE_BTC_ADDRESS",
  "amount": "0.00100000"
}
""")!.AsObject();
var result1 = await client.PostAsync("/v2/withdraw", fields1);
Console.WriteLine("PassimPay request result=" + result1["result"]!.GetValue<int>());
```

--------------------------------

### Create Withdrawal (Java)

Source: https://passimpay.gitbook.io/passimpay-api/integration-examples/cryptocurrency-withdrawals.md

Java example that creates a withdrawal via /v2/withdraw. It uses the shared client and requires a valid recipient address and local order ID. Replace the placeholder BTC address before sending.

```java
ObjectNode fields1 = new ObjectMapper().createObjectNode();
fields1.put("paymentId", 10);
fields1.put("orderId", "payout-1001");
fields1.put("addressTo", "REPLACE_BTC_ADDRESS");
fields1.put("amount", "0.00100000");
JsonNode result1 = client.post("/v2/withdraw", fields1);
System.out.println("PassimPay request result=" + result1.path("result").intValue());
```

--------------------------------

### C#: POST /v2/currencies and /v2/balance

Source: https://passimpay.gitbook.io/passimpay-api/integration-examples/currencies-and-balance.md

Uses the shared signed client to POST empty JSON objects to /v2/currencies and /v2/balance, printing the result. Requires the shared client from the signature and API client example.

```csharp
var fields1 = JsonNode.Parse("""
{}
""")!.AsObject();
var result1 = await client.PostAsync("/v2/currencies", fields1);
Console.WriteLine("PassimPay request result=" + result1["result"]!.GetValue<int>());

var fields2 = JsonNode.Parse("""
{}
""")!.AsObject();
var result2 = await client.PostAsync("/v2/balance", fields2);
Console.WriteLine("PassimPay request result=" + result2["result"]!.GetValue<int>());

```

--------------------------------

### Create Withdrawal (Python)

Source: https://passimpay.gitbook.io/passimpay-api/integration-examples/cryptocurrency-withdrawals.md

Python example that creates a withdrawal via /v2/withdraw. It uses the shared client and requires a valid recipient address and local order ID. Replace the placeholder BTC address before sending.

```python
fields1 = {
  "paymentId": 10,
  "orderId": "payout-1001",
  "addressTo": "REPLACE_BTC_ADDRESS",
  "amount": "0.00100000"
}
result1 = client.post("/v2/withdraw", fields1)
print("PassimPay request result=", result1["result"])
```

--------------------------------

### Validate Address and Get Fees (C#)

Source: https://passimpay.gitbook.io/passimpay-api/integration-examples/cryptocurrency-withdrawals.md

C# example that validates a recipient address via /v2/validateaddress and retrieves fees via /v2/fees. It throws an InvalidOperationException if the address is invalid. Replace the placeholder BTC address before use.

```csharp
var fields1 = JsonNode.Parse("""
{
  "paymentId": 10,
  "address": "REPLACE_BTC_ADDRESS"
}
""")!.AsObject();
var result1 = await client.PostAsync("/v2/validateaddress", fields1);
Console.WriteLine("PassimPay request result=" + result1["result"]!.GetValue<int>());
if (result1["validate"]?.GetValue<int>() != 1) throw new InvalidOperationException("Invalid recipient address");

var fields2 = JsonNode.Parse("""
{
  "paymentId": 10,
  "addressTo": "REPLACE_BTC_ADDRESS",
  "amount": "0.00100000"
}
""")!.AsObject();
var result2 = await client.PostAsync("/v2/fees", fields2);
Console.WriteLine("PassimPay request result=" + result2["result"]!.GetValue<int>());
```

--------------------------------

### Successful response (200) for GET /v2/currencies

Source: https://passimpay.gitbook.io/passimpay-api/list-of-cryptocurrencies

Example JSON response returned by the PassimPay API when the request succeeds. The response includes a result field (1 for success) and a list of cryptocurrency objects with fields such as id, name, currency, network, rateUsd, minDep, minWithdraw, feeNetwork, and decimals.

```json
{
    "result":1,
    "list":[
        {
        "id":10,
        "name":"Bitcoin",
        "currency":"BTC",
        "network":"Bitcoin",
        "rateUsd":"56990.50450929",
        "minDep":null,
        "minWithdraw":null,
        "feeNetwork":null,
        "decimals":8
        },
        ...
    ]
}
```

--------------------------------

### Run request in Go

Source: https://passimpay.gitbook.io/passimpay-api/integration-examples/signature-and-api-client

Command to run the Go client from the source archive root to request the platform currency list.

```bash
cd examples/go && go run . /v2/currencies ../requests/currencies.json
```

--------------------------------

### Signature Verification Examples

Source: https://passimpay.gitbook.io/passimpay-api/integration-examples/webhooks-and-payment-accounting

Code examples for verifying webhook signatures in various programming languages. These functions are also included in the shared client.

```APIDOC
## Signature Verification Examples

### Description
These functions are also included in the shared client. They demonstrate how to verify webhook signatures.

### Languages
Go, PHP, Java, Python, JavaScript, C#

### Usage
Refer to the shared client for the actual implementation. The examples are provided in the source documentation.
```

--------------------------------

### Run request in C#

Source: https://passimpay.gitbook.io/passimpay-api/integration-examples/signature-and-api-client

Command to run the C# client from the source archive root to request the platform currency list.

```bash
dotnet run --project examples/csharp -- /v2/currencies examples/requests/currencies.json
```

--------------------------------

### Java API Client Example

Source: https://passimpay.gitbook.io/passimpay-api/integration-examples/signature-and-api-client.md

Java client that reads platform ID and API key from environment variables, reads a JSON file for request fields, and posts to the PassimPay API. It prints the result code and exits with an error message on failure.

```java
public static void main(String[] args) {
    try {
        if (args.length != 2) throw new IllegalArgumentException("Invalid arguments");
        PassimPay client = new PassimPay(Integer.parseInt(System.getenv("PASSIMPAY_PLATFORM_ID")),
            System.getenv("PASSIMPAY_API_KEY"), "https://api.passimpay.io");
        ObjectNode fields = (ObjectNode) JSON.readTree(Files.readString(Path.of(args[1])));
        JsonNode result = client.post(args[0], fields);
        System.out.println("PassimPay request result=" + result.path("result").intValue());
    } catch (Exception error) {
        System.err.println("PassimPay request failed; check configuration and reconcile before retrying");
        System.exit(1);
    }
}
```

--------------------------------

### C#: Execute Passimpay API request with x-signature

Source: https://passimpay.gitbook.io/passimpay-api/example-of-a-signature.md

C# example using HttpClient. Sends a POST request to https://api.passimpay.io/v2/currencies with the x-signature header and JSON content. Deserializes the response and prints it with indentation. Replace 'signature' with the actual signature.

```csharp
using var httpClient = new HttpClient();

try
{
    httpClient.DefaultRequestHeaders.Add("x-signature", signature);
    httpClient.Timeout = TimeSpan.FromSeconds(10);

    var content = new StringContent(jsonBody, Encoding.UTF8, "application/json");

    HttpResponseMessage response = await httpClient.PostAsync("https://api.passimpay.io/v2/currencies", content);

    int httpCode = (int)response.StatusCode;

    string resultContent = await response.Content.ReadAsStringAsync();

    var result = JsonSerializer.Deserialize<object>(resultContent);

    Console.WriteLine($"HTTP Code: {httpCode}");
    Console.WriteLine("Response:");
    Console.WriteLine(JsonSerializer.Serialize(result, new JsonSerializerOptions { WriteIndented = true }));
}
catch (Exception ex)
{
    Console.WriteLine($"Error: {ex.Message}");
}
```

--------------------------------

### GET /v2/currencies

Source: https://passimpay.gitbook.io/passimpay-api/list-of-cryptocurrencies

Retrieves a list of cryptocurrencies, their exchange rates against the US dollar, and the minimum deposit amount required. This endpoint is used to get an up-to-date list of supported cryptocurrencies and their details.

```APIDOC
## GET /v2/currencies

### Description
Retrieves a list of cryptocurrencies, their exchange rates against the US dollar, and the minimum deposit amount required.

### Method
GET

### Endpoint
`https://api.passimpay.io/v2/currencies`

### Parameters
No parameters required.

### Request Example
No request body required.

### Response
#### Success Response (200)
- **result** (integer) - Request result: `1`: success
- **list** (array) - List of cryptocurrencies

Each item in the list contains:
- **id** (integer) - Currency ID
- **name** (string) - The name of the cryptocurrency (e.g., Bitcoin, Ethereum).
- **currency** (string) - The unique identifier for the cryptocurrency, typically represented in the form of an acronym (e.g., BTC for Bitcoin, ETH for Ethereum).
- **network** (string) - The blockchain network on which the cryptocurrency operates (e.g., Bitcoin network, Ethereum network).
- **rateUsd** (string) - The current exchange rate of the cryptocurrency against the US dollar.
- **minDep** (string or null) - The minimum deposit amount required to use the specified cryptocurrency.
- **minWithdraw** (string or null) - The minimum withdrawal amount required to use the specified cryptocurrency.
- **feeNetwork** (string or null) - Transaction fee charged by the blockchain network (e.g., `1.63`). For Bitcoin, fetch fees using the `/fees` method.
- **decimals** (integer) - The number of decimal places used to represent the smallest divisible unit of a cryptocurrency (e.g., Bitcoin uses 8 decimals where 1 satoshi = 0.00000001 BTC).

#### Response Example
```json
{
    "result":1,
    "list":[
        {
        "id":10,
        "name":"Bitcoin",
        "currency":"BTC",
        "network":"Bitcoin",
        "rateUsd":"56990.50450929",
        "minDep":null,
        "minWithdraw":null,
        "feeNetwork":null,
        "decimals":8
        }
    ]
}
```

#### Error Response (400)
- **result** (integer) - Request result: `0`: error
- **message** (string) - Error description

```

--------------------------------

### Run request in Java

Source: https://passimpay.gitbook.io/passimpay-api/integration-examples/signature-and-api-client

Command to run the Java client from the source archive root to request the platform currency list.

```bash
mvn -q -f examples/java/pom.xml compile exec:java -Dexec.mainClass=PassimPay -Dexec.args="/v2/currencies examples/requests/currencies.json"
```

--------------------------------

### curl: GET /v2/currencies and /v2/fiats

Source: https://passimpay.gitbook.io/passimpay-api/integration-examples/currencies-and-balance.md

Public catalogs use GET rather than the shared signed POST client. These curl commands fetch the currency and fiat lists with fail, silent, show-error, and max-time options.

```sh
curl --fail --silent --show-error --max-time 15 https://api.passimpay.io/v2/currencies
curl --fail --silent --show-error --max-time 15 https://api.passimpay.io/v2/fiats

```

--------------------------------

### Run PassimPay request commands for currency list

Source: https://passimpay.gitbook.io/passimpay-api/integration-examples/signature-and-api-client.md

Commands to run a PassimPay request for the platform currency list from the source archive root. Each command uses the respective language's example file and the request JSON file.

```bash
cd examples/go && go run . /v2/currencies ../requests/currencies.json
```

```bash
php examples/php/passimpay.php /v2/currencies examples/requests/currencies.json
```

```bash
mvn -q -f examples/java/pom.xml compile exec:java -Dexec.mainClass=PassimPay -Dexec.args="/v2/currencies examples/requests/currencies.json"
```

```bash
python3 examples/python/passimpay.py /v2/currencies examples/requests/currencies.json
```

```bash
node examples/javascript/passimpay.mjs /v2/currencies examples/requests/currencies.json
```

```bash
dotnet run --project examples/csharp -- /v2/currencies examples/requests/currencies.json
```

--------------------------------

### GET /v2/currencies

Source: https://passimpay.gitbook.io/passimpay-api/integration-examples/currencies-and-balance.md

Retrieves the public cryptocurrency catalog. No authentication required.

```APIDOC
## GET /v2/currencies

### Description
Retrieves the public cryptocurrency catalog. No authentication required.

### Method
GET

### Endpoint
/v2/currencies

### Parameters
None

### Response
#### Success Response (200)
- **list** (array) - Cryptocurrency catalog.

#### Response Example
{
  "list": [
    {
      "currencyId": 1,
      "ticker": "BTC",
      "network": "Bitcoin"
    }
  ]
}
```

--------------------------------

### Run request in PHP

Source: https://passimpay.gitbook.io/passimpay-api/integration-examples/signature-and-api-client

Command to run the PHP client from the source archive root to request the platform currency list.

```bash
php examples/php/passimpay.php /v2/currencies examples/requests/currencies.json
```

--------------------------------

### Python: Execute Passimpay API request with x-signature

Source: https://passimpay.gitbook.io/passimpay-api/example-of-a-signature.md

Python example using requests library. Sends a POST request to https://api.passimpay.io/v2/currencies with the x-signature header and JSON body. Prints the response or an error message on exception. Replace 'your_signature' with the actual signature.

```python
import json
import requests

body_json = json.dumps(body)

headers = {
    'Content-Type': 'application/json',
    'x-signature': 'your_signature',  # Replace with the actual signature
}

# Send the POST request
url = 'https://api.passimpay.io/v2/currencies'
try:
    response = requests.post(url, headers=headers, data=body_json, timeout=10)

    # Get the HTTP status code
    http_code = response.status_code

    # Parse the JSON response
    result = response.json()
    
    print(f'Response: {result}')
except requests.exceptions.RequestException as e:
    print(f'An error occurred: {e}')
```

--------------------------------

### Go API Client for PassimPay

Source: https://passimpay.gitbook.io/passimpay-api/integration-examples/signature-and-api-client.md

Complete Go client for the PassimPay API. Requires Go 1.22+. It includes signature generation, request serialization, signature verification, and a POST method. The client reads platform ID and API key from environment variables PASSIMPAY_PLATFORM_ID and PASSIMPAY_API_KEY. It uses a 15-second timeout and does not follow redirects. Errors indicate to reconcile before retrying.

```go
// Go 1.22+. Server-side client; no automatic retries.
package main

import (
	"bytes"
	"crypto/hmac"
	"crypto/sha256"
	"encoding/hex"
	"encoding/json"
	"fmt"
	"io"
	"net/http"
	"os"
	"regexp"
	"strconv"
	"time"
	"unicode/utf16"
	"unicode/utf8"
)

func Signature(platformID int, secret string, signatureBody []byte) string {
	mac := hmac.New(sha256.New, []byte(secret))
	fmt.Fprintf(mac, "%d;", platformID)
	mac.Write(signatureBody)
	mac.Write([]byte(";" + secret))
	return hex.EncodeToString(mac.Sum(nil))
}

func SerializeRequest(fields map[string]any) ([]byte, error) {
	normalized := make(map[string]any, len(fields))
	for key, value := range fields {
		if !utf8.ValidString(key) {
			return nil, fmt.Errorf("invalid Unicode key")
		}
		switch v := value.(type) {
		case string:
			if !utf8.ValidString(v) {
				return nil, fmt.Errorf("invalid Unicode string")
			}
		case json.Number:
			integer, err := strconv.ParseInt(string(v), 10, 64)
			if err != nil {
				return nil, fmt.Errorf("use integer values and decimal strings for amounts")
			}
			value = integer
		case int, int8, int16, int32, int64, bool, nil:
		default:
			return nil, fmt.Errorf("use scalar fields and decimal strings for amounts")
		}
		normalized[key] = value
	}
	var buffer bytes.Buffer
	encoder := json.NewEncoder(&buffer)
	encoder.SetEscapeHTML(false)
	if err := encoder.Encode(normalized); err != nil {
		return nil, err
	}
	raw := bytes.TrimSuffix(buffer.Bytes(), []byte("\n"))
	var escaped bytes.Buffer
	for _, point := range string(raw) {
		if point > 0xFFFF {
			high, low := utf16.EncodeRune(point)
			fmt.Fprintf(&escaped, `\u%04x\u%04x`, high, low)
		} else if point >= 0x80 {
			fmt.Fprintf(&escaped, `\u%04x`, point)
		} else {
			escaped.WriteRune(point)
		}
	}
	return bytes.ReplaceAll(escaped.Bytes(), []byte("/"), []byte(`\/`)), nil
}

func VerifySignature(platformID int, secret string, signatureBody []byte, received string) bool {
	actual, err := hex.DecodeString(received)
	if err != nil || len(actual) != sha256.Size {
		return false
	}
	expected, _ := hex.DecodeString(Signature(platformID, secret, signatureBody))
	return hmac.Equal(expected, actual)
}

type Client struct {
	PlatformID int
	Secret     string
	BaseURL    string
	HTTP       *http.Client
}

func NewClient(platformID int, secret string, baseURL string) (*Client, error) {
	if platformID <= 0 || secret == "" {
		return nil, fmt.Errorf("platform ID and API key are required")
	}
	return &Client{platformID, secret, baseURL, &http.Client{
		Timeout:       15 * time.Second,
		CheckRedirect: func(req *http.Request, via []*http.Request) error { return http.ErrUseLastResponse },
	}}, nil
}

func (c *Client) Post(path string, fields map[string]any) (map[string]any, error) {
	if !regexp.MustCompile(`^/v[23]/[a-z]+$`).MatchString(path) {
		return nil, fmt.Errorf("invalid endpoint path")
	}
	body := make(map[string]any, len(fields)+1)
	for key, value := range fields {
		body[key] = value
	}
	body["platformId"] = c.PlatformID
	raw, err := SerializeRequest(body)
	if err != nil {
		return nil, err
	}
	req, err := http.NewRequest(http.MethodPost, c.BaseURL+path, bytes.NewReader(raw))
	if err != nil {
		return nil, err
	}
	req.Header.Set("Content-Type", "application/json")
	req.Header.Set("x-signature", Signature(c.PlatformID, c.Secret, raw))
	response, err := c.HTTP.Do(req)
	if err != nil {
		return nil, err
	}
	defer response.Body.Close()
	if response.StatusCode < 200 || response.StatusCode >= 300 {
		return nil, fmt.Errorf("PassimPay HTTP %d; reconcile before retrying", response.StatusCode)
	}
	var result map[string]any
	decoder := json.NewDecoder(response.Body)
	decoder.UseNumber()
	if err := decoder.Decode(&result); err != nil {
		return nil, err
	}
	var trailing any
	if err := decoder.Decode(&trailing); err != io.EOF {
		return nil, fmt.Errorf("invalid trailing JSON response")
	}
	if result["result"] != json.Number("1") {
		return nil, fmt.Errorf("PassimPay rejected the request; reconcile before retrying")
	}
	return result, nil
}

func run() error {
	if len(os.Args) != 3 {
		return fmt.Errorf("usage: passimpay /v2/method request.json")
	}
	platformID, err := strconv.Atoi(os.Getenv("PASSIMPAY_PLATFORM_ID"))
	if err != nil {
		return err
	}
	client, err := NewClient(platformID, os.Getenv("PASSIMPAY_API_KEY"), "https://api.passimpay.io")
	if err != nil {
		return err
	}
	file, err := os.Open(os.Args[2])
	if err != nil {
		return err
	}
	defer file.Close()
	decoder := json.NewDecoder(file)
	decoder.UseNumber()
	var fields map[string]any
	if err := decoder.Decode(&fields); err != nil {
		return err
	}
	result, err := client.Post(os.Args[1], fields)
	if err != nil {
		return err
	}
	fmt.Printf("PassimPay request result=%v\n", result["result"])
	return nil
}

func main() {
	if err := run(); err != nil {
		fmt.Fprintln(os.Stderr, "PassimPay request failed; check configuration and reconcile before retrying")
		os.Exit(1)
	}
}

```

--------------------------------

### GET /v2/currencies

Source: https://passimpay.gitbook.io/passimpay-api/integration-examples/currencies-and-balance.md

Public catalog endpoint to retrieve available currencies without authentication.

```APIDOC
## GET /v2/currencies

### Description
Public catalog endpoint to retrieve available currencies without authentication.

### Method
GET

### Endpoint
https://api.passimpay.io/v2/currencies

### Parameters
None

### Request Example
```sh
curl --fail --silent --show-error --max-time 15 https://api.passimpay.io/v2/currencies
```

### Response
#### Success Response (200)
- `result` - The result of the request, typically an array of currency objects.

#### Response Example
```json
{
  "result": []
}
```
```

--------------------------------

### Durable H2H accounting example (deposit_store.py)

Source: https://passimpay.gitbook.io/passimpay-api/integration-examples/webhooks-and-payment-accounting.md

Python example for durable SQLite accounting of a verified H2H event. It checks saved recipient details, stores amounts as decimal strings, and creates one accounting entry in a database transaction. The credit policy uses amountReceive after deductions. Call only after IP, signature, and order checks.

```python
"""Durable H2H accounting example. Call only after IP, signature and order checks.

Invoice and static-address deposits require their own reconciliation rules.
This example accounts for one deposit per transaction, recipient, tag and asset.
Adapt the duplicate check if your application needs to track separate outputs.
"""
import json
import re
import sqlite3
from decimal import Decimal


def init_database(path):
    with sqlite3.connect(path) as db:
        db.executescript("""
            CREATE TABLE IF NOT EXISTS deposits (
                event_key TEXT PRIMARY KEY,
                order_id TEXT NOT NULL,
                amount TEXT NOT NULL,
                amount_receive TEXT NOT NULL,
                confirmations INTEGER NOT NULL,
                credited INTEGER NOT NULL DEFAULT 0
            );
            CREATE TABLE IF NOT EXISTS ledger (
                event_key TEXT PRIMARY KEY REFERENCES deposits(event_key),
                order_id TEXT NOT NULL,
                payment_id INTEGER NOT NULL,
                amount TEXT NOT NULL
            );
        """)


def decimal_amount(value):
    if not isinstance(value, str) or not re.fullmatch(r"[0-9]+(?:\.[0-9]+)?", value):
        raise ValueError("Amount must be a decimal string")
    amount = Decimal(value)
    if not amount.is_finite() or amount < 0:
        raise ValueError("Invalid amount")
    return amount


def record_verified_deposit(path, event, platform_id, expected_order_id, expected_payment_id,
                            expected_address, expected_tag=None, minimum_confirmations=None):
    """Returns 'pending', 'credited' or 'duplicate' after committing the transaction.

```

--------------------------------

### Go: Create payment address with /v2/address

Source: https://passimpay.gitbook.io/passimpay-api/integration-examples/h2h-payment-integration.md

Uses the shared client to post a request to /v2/address with paymentId and orderId. The order must be saved before sending; there is no amount field.

```go
fields1 := map[string]any{
    "paymentId": 10,
    "orderId": "h2h-1001",
}
result1, err := client.Post("/v2/address", fields1)
if err != nil { return err }
fmt.Printf("PassimPay request result=%v\n", result1["result"])

```

--------------------------------

### Create cryptocurrency invoice in Go

Source: https://passimpay.gitbook.io/passimpay-api/integration-examples/invoice-link-and-on-ramp.md

Uses the shared client to POST to /v2/createorder with invoice fields. Replace the demonstration order ID with your saved order ID. The response result field is printed.

```go
fields1 := map[string]any{
    "orderId": "invoice-1001",
    "amount": "100.00",
    "symbol": "USD",
    "type": 1,
    "currencies": "10",
}
result1, err := client.Post("/v2/createorder", fields1)
if err != nil { return err }
fmt.Printf("PassimPay request result=%v\n", result1["result"])
```

--------------------------------

### GET /v2/currencies

Source: https://passimpay.gitbook.io/passimpay-api/list-of-cryptocurrencies.md

Fetches the list of cryptocurrencies, their exchange rates against the US dollar, and the minimum deposit amount required.

```APIDOC
## GET /v2/currencies

### Description
Retrieves a list of cryptocurrencies, their exchange rates against the US dollar, and the minimum deposit amount required.

### Method
GET

### Endpoint
https://api.passimpay.io/v2/currencies

### Response
#### Success Response (200)
- **result** (integer) - Request result: `1` for success.
- **list** (array) - List of cryptocurrencies.

Each item in the list contains:
- **id** (integer) - Currency ID.
- **name** (string) - The name of the cryptocurrency (e.g., Bitcoin, Ethereum).
- **currency** (string) - The unique identifier for the cryptocurrency, typically an acronym (e.g., BTC, ETH).
- **network** (string) - The blockchain network on which the cryptocurrency operates.
- **rateUsd** (string) - The current exchange rate of the cryptocurrency against the US dollar.
- **minDep** (string/null) - The minimum deposit amount required.
- **minWithdraw** (string/null) - The minimum withdrawal amount required.
- **feeNetwork** (string/null) - Transaction fee charged by the blockchain network. For Bitcoin, fetch fees using the `/fees` method.
- **decimals** (integer) - The number of decimal places used to represent the smallest divisible unit.

#### Response Example
```json
{
    "result":1,
    "list":[
        {
        "id":10,
        "name":"Bitcoin",
        "currency":"BTC",
        "network":"Bitcoin",
        "rateUsd":"56990.50450929",
        "minDep":null,
        "minWithdraw":null,
        "feeNetwork":null,
        "decimals":8
        }
    ]
}
```

#### Error Response (400)
- **result** (integer) - Request result: `0` for error.
- **message** (string) - Error description.
```

--------------------------------

### Withdrawal Response Format

Source: https://passimpay.gitbook.io/passimpay-api/preparation-for-integration.md

Example response received upon requesting a withdrawal, including paymentId, addressTo, amount, and transactionId.

```APIDOC
## Withdrawal Response

### Description
Response received when initiating a withdrawal request.

### Response Example
```json
{
  "result": 1,
  "paymentId": 71,
  "addressTo": "TLBQDMM3zSLr2Tm88iujny5hBX5G7mS1Jd",
  "amount": "31.42",
  "transactionId": "Nzc2OTc0Njg2NDcyNjE3NzVmMzEzOTM4MzkzMjM2"
}
```

### Fields
- **result** (integer) - Indicates success (1).
- **paymentId** (integer) - Unique identifier for the payment.
- **addressTo** (string) - Cryptocurrency address to send funds to.
- **amount** (string) - Amount in cryptocurrency.
- **transactionId** (string) - Internal transaction hash, usable with the `/withdrawstatus` endpoint.
```
Tokens:
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