### Batch Create Transit Objects in C# (Setup)

Source: https://developers.google.com/wallet/tickets/transit-passes/qr-code/resources/performance-tips

This C# snippet shows the initial setup for making batch requests to Google Wallet. It includes setting up an HttpClient and authorizing the request with a bearer token. The actual object creation logic would follow.

```csharp
/// <summary>
/// Batch create Google Wallet objects from an existing class.
/// </summary>
/// <param name="issuerId">The issuer ID being used for this request.</param>
/// <param name="classSuffix">Developer-defined unique ID for this pass class.</param>
public async void BatchCreateObjects(string issuerId, string classSuffix)
{
  // The request body will be a multiline string
  // See below for more information
  // https://cloud.google.com/compute/docs/api/how-tos/batch//example
  string data = "";

  HttpClient httpClient = new HttpClient();
  httpClient.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue(
    "Bearer",
    credentials.GetAccessTokenForRequestAsync().Result
  );

```

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

### Public Key Example

Source: https://developers.google.com/wallet/smart-tap/introduction/issuer-configuration

This is an example of a public key in PEM format.

```text
-----BEGIN PUBLIC KEY-----
MFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAEchyXj869zfmKhRi9xP7f2AK07kEo
4lE7ZlWTN14jh4YBTny+hRGRXcUzevV9zSSPJlPHpqqu5pEwlv1xyFvE1w==
-----END PUBLIC KEY-----
```

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

### C# Authentication Setup

Source: https://developers.google.com/wallet/tickets/boarding-passes/use-cases/auth

Sets up service account credentials and the Google Wallet API service client in C#.

```csharp
using System.IdentityModel.Tokens.Jwt;
using System.Net.Http.Headers;
using System.Text.RegularExpressions;
using Google.Apis.Auth.OAuth2;
using Google.Apis.Services;
using Google.Apis.Walletobjects.v1;
using Google.Apis.Walletobjects.v1.Data;
using Microsoft.IdentityModel.Tokens;
using Newtonsoft.Json;
using Newtonsoft.Json.Linq;


/// <summary>
/// Demo class for creating and managing Flights in Google Wallet.
/// </summary>
class DemoFlight
{
  /// <summary>
  /// Path to service account key file from Google Cloud Console. Environment
  /// variable: GOOGLE_APPLICATION_CREDENTIALS.
  /// </summary>
  public static string keyFilePath;

  /// <summary>
  /// Service account credentials for Google Wallet APIs
  /// </summary>
  public static ServiceAccountCredential credentials;

  /// <summary>
  /// Google Wallet service client
  /// </summary>
  public static WalletobjectsService service;

  public DemoFlight()
  {
    keyFilePath = Environment.GetEnvironmentVariable(
        "GOOGLE_APPLICATION_CREDENTIALS") ?? "/path/to/key.json";

    Auth();
  }

```

```csharp
/// <summary>
/// Create authenticated service client using a service account file.
/// </summary>
public void Auth()
{
  credentials = (ServiceAccountCredential)GoogleCredential
      .FromFile(keyFilePath)
      .CreateScoped(new List<string>
      {
        WalletobjectsService.ScopeConstants.WalletObjectIssuer
      })
      .UnderlyingCredential;

  service = new WalletobjectsService(
      new BaseClientService.Initializer()
      {
        HttpClientInitializer = credentials
      });
}

```

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

### PHP Example for Event Ticket Template

Source: https://developers.google.com/wallet/tickets/events/resources/template

This PHP code provides an example of how to define a custom event ticket template, mirroring the structure and functionality shown in the Python and Java examples.

```php
<?php

require_once __DIR__ . '/vendor/autoload.php';

use Google\Wallet\Passes\V1\Barcode;
use Google\Wallet\Passes\V1\EventTicketClass;
use Google\Wallet\Passes\V1\EventTicketClass\CardTemplateOverride;
use Google\Wallet\Passes\V1\EventDetails;
use Google\Wallet\Passes\V1\FieldReference;
use Google\Wallet\Passes\V1\Image;
use Google\Wallet\Passes\V1\ImageModule;
use Google\Wallet\Passes\V1\LinkModule;
use Google\Wallet\Passes\V1\Money;
use Google\Wallet\Passes\V1\PredefinedDetails;
use Google\Wallet\Passes\V1\TextModule;
use Google\Wallet\Passes\V1\TimeInterval;
use Google\Wallet\Passes\V1\TicketClass;

// Define a custom event ticket template

// Card title
$cardTitle = new FieldReference([
    'field_name' => 'ticket.eventName',
]);

// Card template override
$cardTemplateOverride = new CardTemplateOverride([
    'card_title' => $cardTitle,
    // Add other card template overrides as needed
]);

// Barcode
$barcode = new Barcode([
    'type' => 'QR_CODE',
    'value' => 'event.ticket.barcodeValue',
    'alternate_text' => 'event.ticket.barcodeAlternateText',
]);

// Details template

// Text module example
$textModule = new TextModule([
    'header' => 'Event Info',
    'body' => 'event.ticket.eventDescription',
    'id' => 'event_info_module',
]);

// Image module example
$imageModule = new ImageModule([
    'image' => new Image([
        'content_type' => 'image/png',
        'file_uri' => 'event.ticket.eventImageUri',
    ]),
    'id' => 'event_image_module',
]);

// Link module example
$linkModule = new LinkModule([
    'uri' => new FieldReference(['field_name' => 'event.ticket.eventWebsiteUri']),
    'description' => 'Visit our website',
    'id' => 'event_website_link',
]);

// Predefined details example
$predefinedDetails = new PredefinedDetails([
    'event_details' => new EventDetails([
        'event_type' => 'CONCERT',
        'event_name' => new FieldReference(['field_name' => 'ticket.eventName']),
        'venue_name' => new FieldReference(['field_name' => 'ticket.venueName']),
        'venue_address' => new FieldReference(['field_name' => 'ticket.venueAddress']),
        'start_time' => new TimeInterval([
            'start_time' => '2024-08-15T19:00:00Z',
            'end_time' => '2024-08-15T23:00:00Z',
        ]),
        // Add other event details as needed
    ]),
    // Add other predefined details as needed
]);

// Create the EventTicketClass with overrides
$customEventTicketClass = new EventTicketClass([
    'template_override' => $cardTemplateOverride,
    'barcode' => $barcode,
    // Add modules and predefined details to the class
    'modules' => [$textModule, $imageModule, $linkModule],
    'predefined_details' => $predefinedDetails,
    // Add other event ticket class properties as needed
]);

// Example of how this might be used with a TicketClass
// $ticketClass = new TicketClass([
//     'id' => 'your_ticket_class_id',
//     'event_ticket_class' => $customEventTicketClass,
//     // ... other TicketClass properties
// ]);

echo $customEventTicketClass->serializeToJsonString();

?>
```

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

### Java Authentication Setup

Source: https://developers.google.com/wallet/retail/loyalty-cards/use-cases/auth

Sets up authentication using a service account key file and initializes the Google Wallet service client. Ensure the GOOGLE_APPLICATION_CREDENTIALS environment variable is set or provide the key file path.

```java
import com.auth0.jwt.JWT;
import com.auth0.jwt.algorithms.Algorithm;
import com.google.api.client.googleapis.batch.BatchRequest;
import com.google.api.client.googleapis.batch.json.JsonBatchCallback;
import com.google.api.client.googleapis.javanet.GoogleNetHttpTransport;
import com.google.api.client.googleapis.json.GoogleJsonError;
import com.google.api.client.googleapis.json.GoogleJsonResponseException;
import com.google.api.client.http.*;
import com.google.api.client.json.gson.GsonFactory;
import com.google.api.services.walletobjects.*;
import com.google.api.services.walletobjects.model.*;
import com.google.auth.http.HttpCredentialsAdapter;
import com.google.auth.oauth2.GoogleCredentials;
import com.google.auth.oauth2.ServiceAccountCredentials;
import java.io.*;
import java.security.interfaces.RSAPrivateKey;
import java.util.*;

/** Demo class for creating and managing Loyalty cards in Google Wallet. */
public class DemoLoyalty {
  /**
   * Path to service account key file from Google Cloud Console. Environment variable:
   * GOOGLE_APPLICATION_CREDENTIALS.
   */
  public static String keyFilePath;

  /** Service account credentials for Google Wallet APIs. */
  public static GoogleCredentials credentials;

  /** Google Wallet service client. */
  public static Walletobjects service;

  public DemoLoyalty() throws Exception {
    keyFilePath =
        System.getenv().getOrDefault("GOOGLE_APPLICATION_CREDENTIALS", "/path/to/key.json");

    auth();
  }

```

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

### Place ID Example

Source: https://developers.google.com/wallet/tickets/open-loop/technical-integration/station-and-stop-names

Example of the Place ID from Google Maps, required for fixed terminals.

```text
ChIJFapKOPSn2EcRHP3RbxxWlTI

```

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

### C# Authentication Setup

Source: https://developers.google.com/wallet/retail/offers/use-cases/auth

Initializes service account credentials and the Google Wallet API service client in C#.

```csharp
using System.IdentityModel.Tokens.Jwt;
using System.Net.Http.Headers;
using System.Text.RegularExpressions;
using Google.Apis.Auth.OAuth2;
using Google.Apis.Services;
using Google.Apis.Walletobjects.v1;
using Google.Apis.Walletobjects.v1.Data;
using Microsoft.IdentityModel.Tokens;
using Newtonsoft.Json;
using Newtonsoft.Json.Linq;


/// <summary>
/// Demo class for creating and managing Offers in Google Wallet.
/// </summary>
class DemoOffer
{
  /// <summary>
  /// Path to service account key file from Google Cloud Console. Environment
  /// variable: GOOGLE_APPLICATION_CREDENTIALS.
  /// </summary>
  public static string keyFilePath;

  /// <summary>
  /// Service account credentials for Google Wallet APIs
  /// </summary>
  public static ServiceAccountCredential credentials;

  /// <summary>
  /// Google Wallet service client
  /// </summary>
  public static WalletobjectsService service;

  public DemoOffer()
  {
    keyFilePath = Environment.GetEnvironmentVariable(
        "GOOGLE_APPLICATION_CREDENTIALS") ?? "/path/to/key.json";

    Auth();
  }

```

```csharp
/// <summary>
/// Create authenticated service client using a service account file.
/// </summary>
public void Auth()
{
  credentials = (ServiceAccountCredential)GoogleCredential
      .FromFile(keyFilePath)
      .CreateScoped(new List<string>
      {
        WalletobjectsService.ScopeConstants.WalletObjectIssuer
      })
      .UnderlyingCredential;

  service = new WalletobjectsService(
      new BaseClientService.Initializer()
      {
        HttpClientInitializer = credentials
      });
}

```

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

### Operator Name Example

Source: https://developers.google.com/wallet/tickets/open-loop/technical-integration/station-and-stop-names

Example of the operator name, which is the transit agency operating the station or route.

```text
TfL

```

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

### Language Example

Source: https://developers.google.com/wallet/tickets/open-loop/technical-integration/station-and-stop-names

Example of the language code for the full display name, following ISO 639-1 standards.

```text
EN

```

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

### C# Authentication Setup

Source: https://developers.google.com/wallet/retail/loyalty-cards/use-cases/auth

Sets up authentication for Google Wallet API using a service account key file. Ensure the GOOGLE_APPLICATION_CREDENTIALS environment variable is set.

```csharp
using System.IdentityModel.Tokens.Jwt;
using System.Net.Http.Headers;
using System.Text.RegularExpressions;
using Google.Apis.Auth.OAuth2;
using Google.Apis.Services;
using Google.Apis.Walletobjects.v1;
using Google.Apis.Walletobjects.v1.Data;
using Microsoft.IdentityModel.Tokens;
using Newtonsoft.Json;
using Newtonsoft.Json.Linq;


/// <summary>
/// Demo class for creating and managing Loyalty cards in Google Wallet.
/// </summary>
class DemoLoyalty
{
  /// <summary>
  /// Path to service account key file from Google Cloud Console. Environment
  /// variable: GOOGLE_APPLICATION_CREDENTIALS.
  /// </summary>
  public static string keyFilePath;

  /// <summary>
  /// Service account credentials for Google Wallet APIs
  /// </summary>
  public static ServiceAccountCredential credentials;

  /// <summary>
  /// Google Wallet service client
  /// </summary>
  public static WalletobjectsService service;

  public DemoLoyalty()
  {
    keyFilePath = Environment.GetEnvironmentVariable(
        "GOOGLE_APPLICATION_CREDENTIALS") ?? "/path/to/key.json";

    Auth();
  }

```

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

### C# Authentication Setup

Source: https://developers.google.com/wallet/retail/gift-cards/use-cases/auth

Sets up service account credentials and the Google Wallet API service client in C#. Ensure the GOOGLE_APPLICATION_CREDENTIALS environment variable is set or provide the key file path.

```csharp
using System.IdentityModel.Tokens.Jwt;
using System.Net.Http.Headers;
using System.Text.RegularExpressions;
using Google.Apis.Auth.OAuth2;
using Google.Apis.Services;
using Google.Apis.Walletobjects.v1;
using Google.Apis.Walletobjects.v1.Data;
using Microsoft.IdentityModel.Tokens;
using Newtonsoft.Json;
using Newtonsoft.Json.Linq;


/// <summary>
/// Demo class for creating and managing Gift cards in Google Wallet.
/// </summary>
class DemoGiftCard
{
  /// <summary>
  /// Path to service account key file from Google Cloud Console. Environment
  /// variable: GOOGLE_APPLICATION_CREDENTIALS.
  /// </summary>
  public static string keyFilePath;

  /// <summary>
  /// Service account credentials for Google Wallet APIs
  /// </summary>
  public static ServiceAccountCredential credentials;

  /// <summary>
  /// Google Wallet service client
  /// </summary>
  public static WalletobjectsService service;

  public DemoGiftCard()
  {
    keyFilePath = Environment.GetEnvironmentVariable(
        "GOOGLE_APPLICATION_CREDENTIALS") ?? "/path/to/key.json";

    Auth();
  }

```

```csharp
/// <summary>
/// Create authenticated service client using a service account file.
/// </summary>
public void Auth()
{
  credentials = (ServiceAccountCredential)GoogleCredential
      .FromFile(keyFilePath)
      .CreateScoped(new List<string>
      {
        WalletobjectsService.ScopeConstants.WalletObjectIssuer
      })
      .UnderlyingCredential;

  service = new WalletobjectsService(
      new BaseClientService.Initializer()
      {
        HttpClientInitializer = credentials
      });
}

```

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

### Stop ID/Route ID Example

Source: https://developers.google.com/wallet/tickets/open-loop/technical-integration/station-and-stop-names

Example of the GTFS ID for a stop or route, used for fixed or mobile terminals respectively.

```text
123456789

```

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

### Callback Message Format Example

Source: https://developers.google.com/wallet/retail/gift-cards/use-cases/use-callbacks-for-saves-and-deletions

This is an example of the JSON message format sent to your callback endpoint for save or delete events.

```json
{
  "classId": "issuer_id.class_id",
  "objectId": "issuer_id.object_id",
  "expTimeMillis": "1234567890000",
  "eventType": "save",
  "nonce": "random_string"
}
```

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

### C# Authentication Setup

Source: https://developers.google.com/wallet/generic/use-cases/auth

Initializes the Google Wallet API client using service account credentials. Ensure the GOOGLE_APPLICATION_CREDENTIALS environment variable is set.

```csharp
using System.IdentityModel.Tokens.Jwt;
using System.Net.Http.Headers;
using System.Text.RegularExpressions;
using Google.Apis.Auth.OAuth2;
using Google.Apis.Services;
using Google.Apis.Walletobjects.v1;
using Google.Apis.Walletobjects.v1.Data;
using Microsoft.IdentityModel.Tokens;
using Newtonsoft.Json;
using Newtonsoft.Json.Linq;


/// <summary>
/// Demo class for creating and managing Generic passes in Google Wallet.
/// </summary>
class DemoGeneric
{
  /// <summary>
  /// Path to service account key file from Google Cloud Console. Environment
  /// variable: GOOGLE_APPLICATION_CREDENTIALS.
  /// </summary>
  public static string keyFilePath;

  /// <summary>
  /// Service account credentials for Google Wallet APIs
  /// </summary>
  public static ServiceAccountCredential credentials;

  /// <summary>
  /// Google Wallet service client
  /// </summary>
  public static WalletobjectsService service;

  public DemoGeneric()
  {
    keyFilePath = Environment.GetEnvironmentVariable(
        "GOOGLE_APPLICATION_CREDENTIALS") ?? "/path/to/key.json";

    Auth();
  }
```

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

### Example SHA-1 Fingerprint Format

Source: https://developers.google.com/wallet/generic/getting-started/auth/android

This is an example of how your app's SHA-1 fingerprint should be formatted. Ensure your fingerprint matches this structure.

```text
DA:39:A3:EE:5E:6B:4B:0D:32:55:BF:EF:95:60:18:90:AF:D8:07:09
```

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

### C# Authentication Setup

Source: https://developers.google.com/wallet/tickets/transit-passes/qr-code/use-cases/auth

Initializes service account credentials and the Google Wallet API service client in C#. Ensure the GOOGLE_APPLICATION_CREDENTIALS environment variable is set.

```csharp
using System.IdentityModel.Tokens.Jwt;
using System.Net.Http.Headers;
using System.Text.RegularExpressions;
using Google.Apis.Auth.OAuth2;
using Google.Apis.Services;
using Google.Apis.Walletobjects.v1;
using Google.Apis.Walletobjects.v1.Data;
using Microsoft.IdentityModel.Tokens;
using Newtonsoft.Json;
using Newtonsoft.Json.Linq;


/// <summary>
/// Demo class for creating and managing Transit passes in Google Wallet.
/// </summary>
class DemoTransit
{
  /// <summary>
  /// Path to service account key file from Google Cloud Console. Environment
  /// variable: GOOGLE_APPLICATION_CREDENTIALS.
  /// </summary>
  public static string keyFilePath;

  /// <summary>
  /// Service account credentials for Google Wallet APIs
  /// </summary>
  public static ServiceAccountCredential credentials;

  /// <summary>
  /// Google Wallet service client
  /// </summary>
  public static WalletobjectsService service;

  public DemoTransit()
  {
    keyFilePath = Environment.GetEnvironmentVariable(
        "GOOGLE_APPLICATION_CREDENTIALS") ?? "/path/to/key.json";

    Auth();
  }

```

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

### Python Authentication Setup

Source: https://developers.google.com/wallet/retail/gift-cards/use-cases/auth

Creates an authenticated HTTP client using a service account file in Python. It specifies the key file path and the required scope for the Wallet Objects API.

```python
def auth(self):
    """Create authenticated HTTP client using a service account file."""
    self.credentials = Credentials.from_service_account_file(
        self.key_file_path,
        scopes=['https://www.googleapis.com/auth/wallet_object.issuer'])

    self.client = build('walletobjects', 'v1', credentials=self.credentials)

```

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

### Location Name and Details Example

Source: https://developers.google.com/wallet/tickets/open-loop/technical-integration/station-and-stop-names

Example of the location name and details, which must uniquely identify a location and be prefixed by the PTO acronym.

```text
TfL_Abbey Road

```

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

### Node.js Authentication Setup

Source: https://developers.google.com/wallet/tickets/transit-passes/qr-code/use-cases/auth

Initializes the service account key file path and sets up authentication for the Google Wallet API in Node.js. The key file path can be provided via an environment variable.

```javascript
const { google } = require('googleapis');
const jwt = require('jsonwebtoken');
const { v4: uuidv4 } = require('uuid');

/**
 * Demo class for creating and managing Transit passes in Google Wallet.
 */
class DemoTransit {
  constructor() {
    /**
     * Path to service account key file from Google Cloud Console. Environment
     * variable: GOOGLE_APPLICATION_CREDENTIALS.
     */
    this.keyFilePath = process.env.GOOGLE_APPLICATION_CREDENTIALS || '/path/to/key.json';
    this.auth();
  }

```

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

### Supported ticketToken Examples

Source: https://developers.google.com/wallet/tickets/boarding-passes/use-cases/import-from-gmail

Examples of valid `ticketToken` values for different code types like barcode128, pdf417, qrCode, and aztecCode.

```text
barcode128:M1HANFENG/ZHU          EMWLPJ SFOAUSGG  123 350J25A 614a 10A1973966772
pdf417:M1HANFENG/ZHU          EMWLPJ SFOAUSGG  123 350J25A 614a 10A1973966772
qrCode:M1HANFENG/ZHU          EMWLPJ SFOAUSGG  123 350J25A 614a 10A1973966772
aztecCode:M1HANFENG/ZHU          EMWLPJ SFOAUSGG  123 350J25A 614a 10A1973966772
```

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

### Partial Resource Response Example

Source: https://developers.google.com/wallet/retail/gift-cards/resources/performance-tips

This is an example of a partial JSON response containing only the requested fields ('kind' and 'items' with 'title' and 'characteristics/length').

```JSON
{
  "kind": "demo",
  "items": [
    {
      "title": "First title",
      "characteristics": {
        "length": "short"
      }
    },
    {
      "title": "Second title",
      "characteristics": {
        "length": "long"
      }
    }
  ]
}
```

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

### PHP Authentication Setup

Source: https://developers.google.com/wallet/retail/gift-cards/use-cases/auth

Initializes the Google API client, service account credentials, and the Google Wallet service client in PHP. The key file path can be set via the GOOGLE_APPLICATION_CREDENTIALS environment variable.

```PHP
use Firebase\JWT\JWT;
use Google\Auth\Credentials\ServiceAccountCredentials;
use Google\Client as GoogleClient;
use Google\Service\Walletobjects;
use Google\Service\Walletobjects\DateTime;
use Google\Service\Walletobjects\Money;
use Google\Service\Walletobjects\LatLongPoint;
use Google\Service\Walletobjects\Barcode;
use Google\Service\Walletobjects\ImageModuleData;
use Google\Service\Walletobjects\LinksModuleData;
use Google\Service\Walletobjects\TextModuleData;
use Google\Service\Walletobjects\TranslatedString;
use Google\Service\Walletobjects\LocalizedString;
use Google\Service\Walletobjects\ImageUri;
use Google\Service\Walletobjects\Image;
use Google\Service\Walletobjects\GiftCardObject;
use Google\Service\Walletobjects\Message;
use Google\Service\Walletobjects\AddMessageRequest;
use Google\Service\Walletobjects\Uri;
use Google\Service\Walletobjects\GiftCardClass;

/** Demo class for creating and managing Gift cards in Google Wallet. */
class DemoGiftCard
{
  /**
   * The Google API Client
   * https://github.com/google/google-api-php-client
   */
  public GoogleClient $client;

  /**
   * Path to service account key file from Google Cloud Console. Environment
   * variable: GOOGLE_APPLICATION_CREDENTIALS.
   */
  public string $keyFilePath;

  /**
   * Service account credentials for Google Wallet APIs.
   */
  public ServiceAccountCredentials $credentials;

  /**
   * Google Wallet service client.
   */
  public Walletobjects $service;

  public function __construct()
  {
    $this->keyFilePath = getenv('GOOGLE_APPLICATION_CREDENTIALS') ?: '/path/to/key.json';

    $this->auth();
  }

```

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

### Node.js Authentication Setup

Source: https://developers.google.com/wallet/retail/gift-cards/use-cases/auth

Initializes the DemoGiftCard class with service account credentials path for Node.js. The key file path is read from the GOOGLE_APPLICATION_CREDENTIALS environment variable or defaults to '/path/to/key.json'.

```javascript
const { google } = require('googleapis');
const jwt = require('jsonwebtoken');
const { v4: uuidv4 } = require('uuid');

/**
 * Demo class for creating and managing Gift cards in Google Wallet.
 */
class DemoGiftCard {
  constructor() {
    /**
     * Path to service account key file from Google Cloud Console. Environment
     * variable: GOOGLE_APPLICATION_CREDENTIALS.
     */
    this.keyFilePath = process.env.GOOGLE_APPLICATION_CREDENTIALS || '/path/to/key.json';
    this.auth();
  }

```

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

### AppTarget with Package Name Example

Source: https://developers.google.com/wallet/reference/rest/v1/AppLinkData

This example demonstrates how to specify a package name for an AppTarget, which is used to open a specific Android application.

```json
{
  "packageName": "com.google.android.gm"
}
```

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

### Example Add to Google Wallet Link

Source: https://developers.google.com/wallet/generic/web

An example of a fully-formed 'Add to Google Wallet' link, including an encoded and signed JWT.

```url
https://pay.google.com/gp/v/save/eyJhbGci6IkpXVCJ9.eyJhdWQiO...6EkC1Ahp6A
```

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

### PHP Authentication and Client Initialization

Source: https://developers.google.com/wallet/generic/use-cases/auth

Sets up service account credentials and initializes the Google Client and Walletobjects service for API calls. Requires application name and scopes to be set.

```php
/**
 * Create authenticated HTTP client using a service account file.
 */
public function auth()
{
  $this->credentials = new ServiceAccountCredentials(
    Walletobjects::WALLET_OBJECT_ISSUER,
    $this->keyFilePath
  );

  // Initialize Google Wallet API service
  $this->client = new GoogleClient();
  $this->client->setApplicationName('APPLICATION_NAME');
  $this->client->setScopes(Walletobjects::WALLET_OBJECT_ISSUER);
  $this->client->setAuthConfig($this->keyFilePath);

  $this->service = new Walletobjects($this->client);
}
```

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

### Python Authentication Setup

Source: https://developers.google.com/wallet/generic/use-cases/auth

Initializes the Google Wallet API client using service account credentials. Ensure the GOOGLE_APPLICATION_CREDENTIALS environment variable is set.

```python
import json
import os
import uuid

from googleapiclient.discovery import build
from googleapiclient.errors import HttpError
from google.oauth2.service_account import Credentials
from google.auth import jwt, crypt


class DemoGeneric:
    """Demo class for creating and managing Generic passes in Google Wallet.

    Attributes:
        key_file_path: Path to service account key file from Google Cloud
            Console. Environment variable: GOOGLE_APPLICATION_CREDENTIALS.
        base_url: Base URL for Google Wallet API requests.
    """

    def __init__(self):
        self.key_file_path = os.environ.get('GOOGLE_APPLICATION_CREDENTIALS',
                                            '/path/to/key.json')
        # Set up authenticated client
        self.auth()
```

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

### Full Display Name Example

Source: https://developers.google.com/wallet/tickets/open-loop/technical-integration/station-and-stop-names

Example of the full display name, which is the value shown in Google Wallet and must match the GTFS feed.

```text
Abbey Road Tram Station

```

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

### Node.js Authentication Setup

Source: https://developers.google.com/wallet/tickets/events/use-cases/auth

Initializes service account credentials and the Google Wallet API service client in Node.js.

```javascript
const { google } = require('googleapis');
const jwt = require('jsonwebtoken');
const { v4: uuidv4 } = require('uuid');

/**
 * Demo class for creating and managing Event tickets in Google Wallet.
 */
class DemoEventTicket {
  constructor() {
    /**
     * Path to service account key file from Google Cloud Console. Environment
     * variable: GOOGLE_APPLICATION_CREDENTIALS.
     */
    this.keyFilePath = process.env.GOOGLE_APPLICATION_CREDENTIALS || '/path/to/key.json';
    this.auth();
  }

```

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

### Example Full Resource Response

Source: https://developers.google.com/wallet/generic/resources/performance-tips

A typical full resource response includes all fields associated with the resource. This example shows a 'demo' resource with 'items'.

```json
{
  "kind": "demo",
  ...
  "items": [
  {
    "title": "First title",
    "comment": "First comment.",
    "characteristics": {
      "length": "short",
      "accuracy": "high",
      "followers": ["Jo", "Will"],
    },
    "status": "active",
    ...
  },
  {
    "title": "Second title",
    "comment": "Second comment.",
    "characteristics": {
      "length": "long",
      "accuracy": "medium"
      "followers": [ ],
    },
    "status": "pending",
    ...
  },
  ...
  ]
}
```

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

### Java Authentication Setup

Source: https://developers.google.com/wallet/tickets/events/use-cases/auth

Initializes Google Wallet API service client with service account credentials. Ensure the GOOGLE_APPLICATION_CREDENTIALS environment variable is set or provide the key file path directly.

```java
import com.auth0.jwt.JWT;
import com.auth0.jwt.algorithms.Algorithm;
import com.google.api.client.googleapis.batch.BatchRequest;
import com.google.api.client.googleapis.batch.json.JsonBatchCallback;
import com.google.api.client.googleapis.javanet.GoogleNetHttpTransport;
import com.google.api.client.googleapis.json.GoogleJsonError;
import com.google.api.client.googleapis.json.GoogleJsonResponseException;
import com.google.api.client.http.*;
import com.google.api.client.json.gson.GsonFactory;
import com.google.api.services.walletobjects.*;
import com.google.api.services.walletobjects.model.*;
import com.google.auth.http.HttpCredentialsAdapter;
import com.google.auth.oauth2.GoogleCredentials;
import com.google.auth.oauth2.ServiceAccountCredentials;
import java.io.*;
import java.security.interfaces.RSAPrivateKey;
import java.util.*;

/** Demo class for creating and managing Event tickets in Google Wallet. */
public class DemoEventTicket {
  /**
   * Path to service account key file from Google Cloud Console. Environment variable:
   * GOOGLE_APPLICATION_CREDENTIALS.
   */
  public static String keyFilePath;

  /** Service account credentials for Google Wallet APIs. */
  public static GoogleCredentials credentials;

  /** Google Wallet service client. */
  public static Walletobjects service;

  public DemoEventTicket() throws Exception {
    keyFilePath =
        System.getenv().getOrDefault("GOOGLE_APPLICATION_CREDENTIALS", "/path/to/key.json");

    auth();
  }

```

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

### CSV Example for Station and Stop Names

Source: https://developers.google.com/wallet/tickets/open-loop/technical-integration/station-and-stop-names

This is an example row of a spreadsheet and its corresponding CSV format for Google Wallet transit integration. It shows the required columns and sample data.

```csv
Operator,Location name/details,Full display name for Google Wallet,Language,Place ID,Stop / Route ID
TfL,TfL_Abbey Road,Abbey Road Tram Station,EN,ChIJFapKOPSn2EcRHP3RbxxWlTI,123456789

```