Quick Start

Initial setup

1. Provide a email and test domain to create a sandbox merchant account
2. After receiving the email, login to the merchant dashboard by clicking the link in the email, and get the merchantNo, secret, appId
3. If you’re ready to start developing, see our Authentication Guide

Note

• We maintain an IP whitelist for test domains. Only whitelisted domains are authorized to access the Onerway API
• The merchant portal credentials will be sent to the registered email address. Essential credentials including Merchant Number, Secret Key, and App ID must be obtained by logging into the merchant portal

For enhanced security, users must complete a mandatory password reset procedure during their initial merchant portal authentication.

Get credentials

Testing Requirements

Before proceeding with production deployment, developers should:

• Thoroughly test all API integrations in the sandbox environment
• Validate API responses and error handling
• Implement proper webhook handling

Note

The sandbox environment provides a safe testing ground that mirrors production functionality without affecting live transactions.