The Payment API you to process credit card or ACH withdrawal payments online, through your existing website or application. Payment types include Purchase, Preauthorization, Capture, Verify, Refund, Reverse, and ACH Withdraw.

A successful payment processed through the Payment API will create a transaction object in the Helcim system. Where an existing customerCode or invoiceNumber was not associated with the payment, new ones will be created and returned in the response.

Payment API endpoints

Review the following documentation for specific payment functionality available in the Payment API.

• Process a credit card payment
• Preauthorize a credit card payment
• Capture a credit card payment
• Reverse a credit card payment
• Refund a credit card payment
• Verify credit card details
• Withdraw an ACH payment

Payment API functionality

Review the following documentation for specific payment functionality available through the Payment API.

• Idempotency keys for payments
• Suspected duplicate transactions
• Processing with multiple currencies
• Processing terminals