> For the complete documentation index, see [llms.txt](https://developer.convergegate.com/legacy/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://developer.convergegate.com/legacy/wallet-api/introduction.md).

# Introduction

We have language bindings in curl, php, and Go! You can view code examples in the dark area to the right, and you can switch the programming language of the examples with the tabs in the top right.

Our API has predictable resource-oriented URLs, accepts [form-encoded](https://en.wikipedia.org/wiki/POST_\(HTTP\)#Use_for_submitting_web_forms) request bodies, returns [JSON-encoded](https://www.json.org/json-en.html) responses, and uses standard HTTP response codes, authentication, and verbs

## Authentication

Authenticate your account by including your secret key in API requests.

{% content-ref url="/pages/FDQV132TPGmmPBRqKUE9" %}
[Authentication](/legacy/wallet-api/introduction/authentication.md)
{% endcontent-ref %}

## Metadata

Some updatable objects might have a metadata parameter.

{% content-ref url="/pages/VqK9yRYcG4FJmLjtVDZg" %}
[Metadata](/legacy/wallet-api/introduction/metadata.md)
{% endcontent-ref %}

{% hint style="info" %}
**Good to know:** Dive a little deeper and start exploring our API reference to get an idea of everything that's possible with the AP, jump right to the\[ [Authentication](/legacy/card-server-to-server/overview/authentication.md)]\(/pages/FDQV132TPGmmPBRqKUE9)
{% endhint %}