The Invoicera PHP Sample Code by Invoicera demonstrates how to interact with the API to send requests and responses in XML format. API Key is required to authenticate according to the example that provides an API URL.
RentPaidOnline, a division of EFX Financial Services, has just announced the release of the RentPaidOnline Partner API (PAPI) which will provide selected and certified partners the ability to integrate the RentPaidOnline platform into applications and property management systems.
Celery, flexible ecommerce solution provider, allows users to accept pre-orders without charging the customer until the product is ready to ship. On the flip side, customers also have the capability to pre-pay for goods and services. In addition to flexible payment options, Celery allows developers to integrate its functionality with third party apps and workflows via the Celery API.