API Reference

<div>

<img src="https://files.readme.io/7199a0e-apireference_icon.png" alt="API Reference icon" align="left"> Welcome to Nexio's API Reference documentation.

Nexio's APIs are organized into the following services:
</div>

<div class="doc-ContentContainer">

<div class="api-ContentBlock">
  <a href="ref:createonetimeusetoken" style={{ textDecoration: "none" }}>
    <div class="api-DivTitle">Payments API Reference →</div>
  </a>
</div>

<div class="api-ContentBlock">
  <a href="ref:createrecipient" style={{ textDecoration: "none" }}>
    <div class="api-DivTitle">Payouts API Reference →</div>
  </a>
</div>

<div class="api-ContentBlock">
  <a href="ref:viewtransactionpaymentid" style={{ textDecoration: "none" }}>
    <div class="api-DivTitle">Reporting API Reference →</div>
  </a>
</div>

<div class="api-ContentBlock">
  <a href="ref:whoami" style={{ textDecoration: "none" }}>
    <div class="api-DivTitle">Management API Reference →</div>
  </a>
</div>

<div class="api-ContentBlock">
  <a href="ref:registerwebhookurls" style={{ textDecoration: "none" }}>
    <div class="api-DivTitle">Dev Tools API Reference →</div>
  </a>
</div>

<div class="api-ContentBlock">
  <a href="ref:onlineapplication" style={{ textDecoration: "none" }}>
    <div class="api-DivTitle">Reseller Services API Reference →</div>
  </a>
</div>

</div>

# Architecture

<div>

Nexio APIs use the REST (Representational State Transfer) architecture for simplicity and scalability. REST uses HTTP methods (GET, POST, PUT, DELETE) and exchanges data in formats like JSON or XML.

We have provided an outline of all the API endpoints and connections in the [API diagrams](doc:api-diagrams) topic.
</div>

# Security

To get started with the Nexio APIs, you need a Nexio username and password for an API user. Contact [Integrations Support](page:contact-us) to request credentials, if needed.

For many of the Nexio endpoints, you must provide your [authentication](doc:authentication) information for an API user. See each endpoint for more information on the required authentication. The form of authentication required for each endpoint is listed in an "Authorization" section at the top right panel of each endpoint reference.

# Changelog

<div>

To see the most recent updates to the APIs, as well as everything else Nexio documentation, visit the [Changelog](/changelog).

<br/>If you have questions or other feedback, [contact us](page:contact-us).
</div>