> For the complete documentation index, see [llms.txt](https://doc.paynet.com.tr/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://doc.paynet.com.tr/english/api-integration.md).

# API Integration

There are two ways to accept payments on Paynet with API integration. You can accept payment with **Payment** method without 3D model or you can accept payment with "3D Payment" on 3D model. You can also perform the following task with these services.

* [x] Perform installment transactions
* [x]  Save the card during the process
* [x]  Use the saved card in transactions

{% hint style="info" %}
Note that you will need a Paynet API **secret key** before using these services. [See more](https://doc.paynet.com.tr/english/what-i-need)
{% endhint %}

## Payment

You can accept payment with this service by credit or debit cards and 3D verification doesn’t perform.

{% content-ref url="/pages/-LnMJxamwzZdYW-BUDpz" %}
[Payment](/english/api-integration/payment-1.md)
{% endcontent-ref %}

## 3D Payment

You can accept payment with this service by credit or debit cards with 3D verification.

{% content-ref url="/pages/-LnMHWi01NMSSgdXvlnW" %}
[3D Payment](/english/api-integration/payment.md)
{% endcontent-ref %}