# Generate Signature Payment API

Signature transaction is a security feature that allows the merchant to identify the transaction script from faspay system

The signature for tokenization registration API generated by these steps:

1. stringToSign = "##" + strings.ToUpper(username)  + "##" + strings.ToUpper(password) + "##" + strings.ToUpper(merchant\_tranid) + "##" + amount + "##" + "0" + "##"
2. hash sha256 stringToSign in binary
3. encode to base64

**Sample Generate Signature :**

stringToSign = "##" + "MPGS\_PURCHASE" + "##" + "ABCDE" + "##" + "TKN106" + "##" + "10000.00" + "##" + "0" + "##"


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