> For the complete documentation index, see [llms.txt](https://docs.faspay.co.id/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.faspay.co.id/getting-started/faspay-sendme/authentication/signature.md).

# Signature

Signature is used by Faspay to verify that your request is not altered by attackers. The signature process use format as follows :

{% hint style="info" %}
 **SHA-256 HMAC is used to generate the signature with your API secret as the key**
{% endhint %}