# IPSP Integration *Article Topics:* [*Billers*](/getting-started/getting-started/getting-started-with-billers.md) Adding a new IPSP, [Internet Payment Service Processor](/additional-resources/common-terms.md#biller), requires changes to NATS and testing, which we can no longer do for free. For pricing please contact sales, 732-385-1536 extension 1135 or . We do integrations on a first-come, first-serve basis -- the IPSPs ahead of you will be finished before yours is started. You may need to expand or change some parts of your system; we will notify as soon as we discover a missing feature. Your biller must send recurring membership, refund, credit, and chargeback information to NATS using a postback or through a poll. ## What's Needed Here's what we need before you can become an [IPSP ](/additional-resources/common-terms.md#biller)in NATS. ### Documentation We need documentation on your URLs, data formats, data fields, and your responses -- including error responses. We also need sample responses and error codes. Sample code will be useful, but is not required. Please see the [Biller Details Query Letter](/using-nats/one-off-articles/biller-details-query-letter.md) for more information. ### Test Account Information We need a test account for test sign-ups. We don't need a full account, but we must be able to perform all of the following actions: login, configure our site, and add products to our site. Please tell us if you have test credit card numbers. ### Forcing Actions We want the ability to force refunds and chargebacks during our testing. If your system only allows data pulls once an hour, please lift this restriction on us during the testing period. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.toomuchmedia.com/using-nats/one-off-articles/ipsp-integration.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.