### Install Apple Pay Decrypt

Source: https://github.com/foxy/foxy-node-apple-pay-decrypt/blob/main/README.md

Installs the 'apple-pay-decrypt' package using npm. This is the first step to using the library in your Node.js project.

```bash
npm i --save apple-pay-decrypt
```

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

### Example Private Key PEM Format

Source: https://github.com/foxy/foxy-node-apple-pay-decrypt/blob/main/README.md

An example of the expected format for a private key PEM file used for Apple Pay decryption. This file contains the private key information.

```text
Bag Attributes
    localKeyID: 90 C8 20 E7 8A 2A E5 7E 33 06 FD C5 43 47 9F 15 2F DE 73 90 
Key Attributes: <No Attributes>
-----BEGIN PRIVATE KEY-----
8nG5lEs5hYJ2WG9Yo39m1gyCHeNse5sOrph9Dq7tro5mO+nX3XaVaIi3MHFl9Hq6
YwKcj8BAm4LvxkCLODZVIsqYZbNTzyTWbKiz7G53Rt6XqFaQVlqlSxvA97SUfq62
qDRXQRMETBev1j7Y1w/v2K0CIAlnnXPVX52g5FTadoFyVq2a91sA4ao4
-----END PRIVATE KEY-----
```

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

### Example Certificate PEM Format

Source: https://github.com/foxy/foxy-node-apple-pay-decrypt/blob/main/README.md

An example of the expected format for a certificate PEM file used for Apple Pay decryption. This file contains the public certificate information.

```text
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----
```

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

### Convert Certificate and Create PKCS12

Source: https://github.com/foxy/foxy-node-apple-pay-decrypt/blob/main/README.md

Converts the downloaded Apple Pay certificate from DER to PEM format and then creates a PKCS12 file from the private key and the converted certificate. The PKCS12 file will be password protected.

```openssl
openssl x509 -inform DER -outform PEM -in apple_pay.cer -out temp.pem
openssl pkcs12 -export -out key.p12 -inkey private.key -in temp.pem
```

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

### Decrypt Apple Pay Token in Node.js

Source: https://github.com/foxy/foxy-node-apple-pay-decrypt/blob/main/README.md

Demonstrates how to use the 'apple-pay-decrypt' library to decrypt an Apple Pay token. It requires reading certificate (.pem) and private key (.pem) files and then calling the decrypt method on a PaymentToken instance.

```JavaScript
const PaymentToken = require('apple-pay-decrypt')

const certPem = fs.readFileSync(path.join(__dirname, '../path/to/certPem.pem'), 'utf8')
const privatePem = fs.readFileSync(path.join(__dirname, '../path/to/privatePem.pem'), 'utf8')

const tokenFromApplePay = {...} // from Apple Pay

const token = new PaymentToken(tokenFromApplePay)

const decrypted = token.decrypt(certPem, privatePem)
```

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

### Apple Pay Token Structure

Source: https://github.com/foxy/foxy-node-apple-pay-decrypt/blob/main/README.md

Illustrates the typical JSON structure of a token received from Apple Pay, including version, data, signature, and header information like ephemeral public key, public key hash, and transaction ID.

```JavaScript
{
    "version": "EC_v1",
    "data": "vxae4VଵVFHqdtWakaJ1wqQHyel...<a lot more data>...ggVQsfUxBXR8=",
    "signature": "MIAGCSqGSIb3DQEHAqCA...<a lot more data>...MAAAAAAAA=",
    "header": {
        "ephemeralPublicKey": "MFkwEwYHKoZIzj0CAQYIKoZICZImiZPyLGQBAQwgbWVyY2hhbnQuY29tLmdy332d55suNAl1RIZi3KIT5hwmiSKSch9+6OOGlRZw0xOTAy4jejmO0A==",
        "publicKeyHash": "0aB0KxDCKoZICZImiZPyLGQBAQwoIwz3m6bKxuqPe+F6yQco=",
        "transactionId": "54829332dd6db37d06KoZICZImiZPyLGQBAQw5e6f35059acad43133d792fc139"
    }
}
```

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

### Convert PKCS12 to PEM Files

Source: https://github.com/foxy/foxy-node-apple-pay-decrypt/blob/main/README.md

Converts the PKCS12 file and the original certificate into PEM format files. These PEM files (certificate and private key) are required by the 'apple-pay-decrypt' package.

```openssl
openssl x509 -inform DER -outform PEM -in apple_pay.cer -out certPem.pem
openssl pkcs12 -in key.p12 -out privatePem.pem -nocerts -nodes
```

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

### Generate Private Key and CSR

Source: https://github.com/foxy/foxy-node-apple-pay-decrypt/blob/main/README.md

Generates a private key and a Certificate Signing Request (CSR) using OpenSSL. These are essential steps in the process of obtaining an Apple Pay Payment Processing Certificate.

```openssl
openssl ecparam -out private.key -name prime256v1 -genkey
openssl req -new -sha256 -key private.key -nodes -out request.csr
```

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

### Decrypted Apple Pay Payment Data

Source: https://github.com/foxy/foxy-node-apple-pay-decrypt/blob/main/README.md

Shows the structure of the data after successfully decrypting an Apple Pay token. This includes sensitive payment information such as the primary account number, expiration date, currency code, and transaction amount.

```JavaScript
{
  applicationPrimaryAccountNumber: '17029283048730',
  applicationExpirationDate: '231231',
  currencyCode: '840',
  transactionAmount: 500,
  deviceManufacturerIdentifier: '544555544456',
  paymentDataType: '3DSecure',
  paymentData: {
    onlinePaymentCryptogram: 'IE0QTuXZlbG9wZXIgUmiQAQojEBhgA='
  }
}
```

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