> For the complete documentation index, see [llms.txt](https://dev.flexshopper.com/medusa/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://dev.flexshopper.com/medusa/readme.md).

# Introduction

Welcome to the FlexShopper API. We're excited to partner with you!

There are two ways to integrate with FlexShopper:

<table data-view="cards"><thead><tr><th></th><th></th><th data-hidden data-card-target data-type="content-ref"></th><th data-hidden data-card-cover data-type="files"></th></tr></thead><tbody><tr><td><strong>Medusa</strong></td><td>A powerful REST API that you can call from anywhere.</td><td><a href="/medusa/integration-guides/medusa.md">Medusa</a></td><td><a href="https://4176832357-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FjXJ1xrzW7EjxBfTqGsM2%2Fuploads%2Fgit-blob-f36e7816c943a903e85170351fd280dc3403c531%2Fserver-card-bg.png?alt=media">server-card-bg.png</a></td></tr><tr><td><strong>Payment Plugin</strong></td><td>A comprehensive iframe for your web app.</td><td><a href="/medusa/integration-guides/payment-plugin.md">Payment Plugin</a></td><td><a href="https://4176832357-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FjXJ1xrzW7EjxBfTqGsM2%2Fuploads%2Fgit-blob-79ec33124bab177581f6572b0f968021cac8f2f6%2Fbrowser-card-bg.png?alt=media">browser-card-bg.png</a></td></tr></tbody></table>

## Medusa

[Medusa](/medusa/integration-guides/medusa.md), our REST API, is suitable for you either if you don't have a **web** application, or if you're simply seeking more control over your visual interface. Medusa enables you to integrate with FlexShopper while preserving your own application's look and feel.

{% hint style="success" %}
We strongly recommend using the Medusa integration.
{% endhint %}

{% content-ref url="/pages/RC54UowFsRbkvi1Yw4Wa" %}
[Medusa](/medusa/integration-guides/medusa.md)
{% endcontent-ref %}

## Payment Plugin

[Payment Plugin](/medusa/integration-guides/payment-plugin.md), the suite of web components and iframe, is suitable for you if you already have a customer-facing **web** application UI. This integration is typically the easiest of the two, but requires you to already have a web application to embed Payment Plugin into as an iframe.

{% content-ref url="/pages/5aLfZp5RsTcdpOxBbsY0" %}
[Payment Plugin](/medusa/integration-guides/payment-plugin.md)
{% endcontent-ref %}