DocsWelcome to Cost+ Developer Docs
Welcome to Cost+ developer documentation
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 URL
| URL | |
|---|---|
| API | https://api.costplus.online/v1 |
There is no separate sandbox URL. Cost+ uses a single API endpoint. Whether a transaction is processed in sandbox or production mode is determined by your API key — specifically whether the website (project) in the Merchant Portal is configured as sandbox or production.
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
- Quickstart — Accept your first payment in 5 minutes.
- 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.
- SDKs — Official libraries for Node.js, Python, PHP, Java/Kotlin, C#/.NET, and Ruby.
- Plugins & Integrations — Pre-built plugins for popular platforms.