redsys-client

Redsys redirection client inspired from the Redsys PHP and Java official clients.

Redsys Client Usage

Client initialization

1. Install the library

npm install redsys-client

2. Create the Redsys Client

Preferred (constructor style):

const redsys = new Redsys({
  Ds_Merchant_MerchantCode: "999008881",
  Ds_Merchant_Terminal: "1",
  Ds_Merchant_TransactionType: "0",
  Ds_Merchant_Amount: 1000,
  Ds_Merchant_Currency: "978",
  Ds_Merchant_Order: "1234567890",
  Ds_Merchant_MerchantURL: "https://www.example.com",
});

Legacy-compatible (still supported):

const redsys = new Redsys();
redsys.merchantParameters = {
  Ds_Merchant_MerchantCode: "999008881",
  Ds_Merchant_Terminal: "1",
  Ds_Merchant_TransactionType: "0",
  Ds_Merchant_Amount: 1000,
  Ds_Merchant_Currency: "978",
  Ds_Merchant_Order: "1234567890",
  Ds_Merchant_MerchantURL: "https://www.example.com",
};

Fluent setup alternative:

const redsys = new Redsys().setMerchantParameters({
  Ds_Merchant_MerchantCode: "999008881",
  Ds_Merchant_Terminal: "1",
  Ds_Merchant_TransactionType: "0",
  Ds_Merchant_Amount: 1000,
  Ds_Merchant_Currency: "978",
  Ds_Merchant_Order: "1234567890",
  Ds_Merchant_MerchantURL: "https://www.example.com",
});

Redsys request

1. Create the needed merchant parameters and secret to call Redsys

const secret = "sq7HjrUOBfKmC576ILgskD5srU870gJ7";

const merchantParameters = redsys.createMerchantParameters();

const signature = redsys.createMerchantSignature(secret);

Redsys redirect validate signature

1. To validate a given signature, use createMerchantSignatureNotif. This method will return a URL-safe base64 string. To make sure the comparison is fair, this method should also be applied to the received signature, the library includes an exported function called fromBase64 to do so.

const computedSignature = redsys.createMerchantSignatureNotif(secret, params);

if(computedSignature === fromBase64(receivedSignature)){
  console.log("OK")
} else {
  console.log("INVALID")
}

2. As an alternative, a function isMerchantSignatureValid is provided, this function will return a boolean if the signature is valid or invalid.

const isValid = redsys.isMerchantSignatureValid(receivedSignature, secret, params);

Useful resources

• Official Redsys documentation

• Test Parameters