Paymaster Utilities

The paymaster utilities contains essential utilities for using paymasters on zkSync Era.

Contract interfaces

Constant ABI definition for the Paymaster Flow Interface.

Functions

encodeApprovalBased

Returns encoded input for an approval-based paymaster.

Inputs

Parameter	Type	Description
tokenAddress	String	Address of paymaster token.
minimalAllowance	BigInteger	Paymaster allowance.
input	byte[]

encodeGeneral

As above but for general-based paymaster.

Inputs

Parameter	Type	Description
input	byte[]

Examples

Creating General paymaster parameters.

PaymasterParams paymasterParams = new PaymasterParams(
  "0x0a67078A35745947A37A552174aFe724D8180c25",
  Numeric.hexStringToByteArray(FunctionEncoder.encode(
    Paymaster.encodeGeneral(
      new byte[] {})
     )
    )
  );

Creating ApprovalBased paymaster parameters.

PaymasterParams paymasterParams = new PaymasterParams(
  "0x0a67078A35745947A37A552174aFe724D8180c25",
  Numeric.hexStringToByteArray(FunctionEncoder.encode(
    Paymaster.encodeApprovalBased(
      "0x65C899B5fb8Eb9ae4da51D67E1fc417c7CB7e964",
      BigInteger.ONE,
      new byte[] {})
     )
    )
  );