# Overview The APIs in this section are still under development and may change. Read (GET) APIs are shown. The additional Create, Update and Delete APIs are also included. Some of these are optional APIs and the specific functionality can also be used via the Nexus Service Desk. APIs are exposed from Nexus to the IPSs and the FXPs. PSPs and SAPs connect to Nexus via the IPS. The IPSO is free to reuse the Nexus APIs or adapt these APIs to their domestic implementation. Nexus however expects the IPS to adhere to the Nexus specifications. Internal APIs that are only used by Nexus services to communicate with each other are not shown. --- # 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.nexusglobalpayments.org/apis/overview.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.