API Reference

Base URL: https://api.billwave.example (production) · https://sandbox.billwave.example (sandbox)

The Server URL selector in the playground can use either environment. Switch it to https://sandbox.billwave.example when you want to test against sandbox data and test provider keys.

All endpoints require authentication via API key in the Authorization header:

Authorization: Bearer billwave_sk_your_api_key

Browse the endpoints in the sidebar to see interactive documentation with request/response schemas, code samples, and a built-in playground.