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If you are integrating the HaiPay Direct API, the core workflow is: create an order, return payment details, receive asynchronous notifications, and validate parameters and signatures correctly. Merchants who want to display payment methods to users and accept payments on their own checkout page can integrate HaiPay using a pure API (Direct API) approach. For Direct API interfaces, merchants must have PCI-DSS certification if they handle card number information themselves.

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1. Collection Process

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2. Payment Process

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3. API Parameters

For details, please refer to: API Description

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4. End-to-End Testing

For details, please refer to: End-to-End Testing
Last modified on April 15, 2026