Intuit QuickBooks Online API

Intuit Hosted PayPage is a payment form that can be integrated into a software application. PayPage is optimized for merchant-facing or customer-facing applications. The PayPage is often used for eCommerce applications where the user wants to accept direct payments from their customers.

The API consists of getting a transaction ticket and operation id, redirecting the merchant to the PayPage terminal, querying for transaction status, and optionally processing transaction results sent from PayPage to the user's website. It uses RESTful calls and responses are name value pairs.