Introduction
Welcome to Cost+ developer documentation
Welcome to Cost+ Developer Docs
Cost+ is a modern payment processing platform that enables merchants to accept payments across multiple channels with transparent, cost-plus pricing. This documentation covers everything you need to integrate with the Cost+ API.
API Base URLs
| Environment | URL |
|---|---|
| Live | https://api.costplus.online/v1 |
| Mock / Testing | https://stoplight.io/mocks/nopayn/nopayn/37452482 |
[!NOTE] Use the mock URL during development to test your integration without processing real transactions. Switch to the live URL when you are ready to go live.
Security
All API requests are secured with HTTP Basic Authentication. You must connect over TLS 1.2 or higher.
curl -u YOUR_API_KEY: https://api.costplus.online/v1/orders/Quick Links
- Authentication — Set up API credentials and learn how auth works.
- Testing Your Integration — Test cards, sandbox environment, and going live.
- FAQ & Troubleshooting — Common issues and how to resolve them.
- Guides — Step-by-step walkthroughs for common integration patterns.
- Payment Methods — Supported payment methods and configuration.
- Plugins & Integrations — Pre-built plugins for popular platforms.