API Reference

The Cost+ Payment API lets you create and manage orders, process payments, handle refunds, and manage payment links.

Base URLs

Authentication

All API requests use HTTP Basic Auth. Use your API key as the username with an empty password:

curl -u {api_key}: https://api.costplus.online/v1/orders/

See the Authentication guide for detailed setup instructions.

API Sections

Orders API

Create, retrieve, update, and cancel payment orders. Includes refund, capture, and void operations.

Payment Links API

Create and manage reusable payment links that support multiple payment attempts.

Search API

Search across your orders using flexible criteria.

Self Service API

Manage your project settings and retrieve supported currencies.

Webhooks

Receive real-time notifications when order or transaction statuses change.