> 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/apm-checkout-blik/overview.md).

# Overview

The APM Checkout (BLIK) integration allows customers to complete transactions using the BLIK payment method. This integration supports server-to-server (S2S) payments for Alternative Payment Methods (APMs) that involve a redirect flow. In this process, transaction details are securely exchanged between servers, and customers are redirected to a BLIK payment page to finalize the transaction, ensuring secure and efficient payment handling.

## **How It Works**

When customers select BLIK at checkout, the merchant creates a session with Converge Gate, providing necessary transaction details and customer information. Converge Gate generates a session ID and a redirect URL, which the customer uses to proceed with the payment.

1. **Customer Pays with APM**:

* The customer initiates the payment by selecting APM (BLIK) as their payment method during the checkout process.

2. **Merchant Creates a Session**:

* The merchant sends the transaction details and customer information to Converge Gate to create a checkout session.

3. **Returns ID and Redirect URL**:

* Converge Gate processes the session creation request and returns a unique session ID along with a redirect URL.

4. **Redirects to URL**:

* The customer is redirected to the provided URL (managed by APM) to proceed with the payment.

5. **Receives Result from Bank via APM**:

* The APM communicates with the bank to process the transaction and receives the result, indicating whether the payment was successful or not.

6. **Returns to the success\_url**:

* Based on the transaction result, the customer is redirected back to the merchant's success URL if the payment was successful.

7. **Retrieves Session ID & Updates Status**:

* The merchant retrieves the session ID from Converge Gate to check the transaction status and updates their records accordingly.

## Process Flow

{% content-ref url="/pages/3BmLjbx0i4DIjLMObhpL" %}
[Process Flow](/legacy/apm-checkout-blik/overview/process-flow.md)
{% endcontent-ref %}

## Testing

{% content-ref url="/pages/AQ6iToG3xlOCquUPIwNA" %}
[Testing](/legacy/apm-checkout-blik/overview/testing.md)
{% endcontent-ref %}

## Errors

{% content-ref url="/pages/PeQN5dIpheCHqs0QT8zM" %}
[Errors](/legacy/apm-checkout-blik/errors.md)
{% endcontent-ref %}

## Create a Checkout Session

{% content-ref url="/pages/6mt8gkE31qNPwUqnAGxf" %}
[Create a checkout session](/legacy/apm-checkout-blik/create-a-checkout-session.md)
{% endcontent-ref %}

## Retrieve a Checkout Session

{% content-ref url="/pages/a08vYY78xq1DuSrcjtel" %}
[Retrieve a Checkout Session](/legacy/apm-checkout-blik/retrieve-a-checkout-session.md)
{% endcontent-ref %}

## Webhook Event Notification

{% content-ref url="/pages/C43BVlhwfXteE1nSueXU" %}
[Webhoook Event Notification](/legacy/apm-checkout-blik/webhoook-event-notification.md)
{% endcontent-ref %}

## Pay a Checkout Session

{% content-ref url="/pages/kIuEf0y3mtu0cNBnsk2i" %}
[Pay a Checkout Session](/legacy/apm-checkout-blik/pay-a-checkout-session.md)
{% endcontent-ref %}