Sandbox testing

Complete one test collection and confirm create, cashier, and webhook show the same final state.

Test gateway:

https://api-beta.ucashier.ink

Test dashboard (register a test merchant): https://beta.ucashier.ink/#/user/register

Complete success path

1. Complete the Quickstart.
2. Record requestId, orderNo, merchantOrderNo, and cryptoAmount from the create response.
3. Confirm the cashier asset, network, address, and amount match the response.
4. Confirm the webhook verifies, updates the business order once, and acknowledges the callback.

Continue to the production checklist