The merchant Configuration endpoint allows you to see the checkout configuration for a merchant.
Base URLs per Region
Production - US - https://gateway.us.zip.co/
Sandbox (Test) - US - https://gateway.sand.us.zip.co/
Production - CA - https://gateway.ca.zip.co/
**Sandbox (Test) - CA - https://gateway.sand.ca.zip.co/
Production - MX - https://gateway.mx.zip.co/
Sandbox (Test) - MX - https://gateway.sand.mx.zip.co/