ACHeck21 is a payment processing system that allows users to process both ACH and Check21 transactions. The ACHeck21 API allows developers to access and integrate the functionality of ACHeck21 with other applications. Some example API methods include retrieving account information, processing transactions, and retrieving transaction data.
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The ACheck21 Java Sample Code by ACheck21 demonstrates how to access the API to integrate payments into applications. The guide shows developers how to construct and send a batch with payment transactions.