# CF Implementation

<figure><img src="/files/D3xcFrOU5aVqLL97oWKK" alt=""><figcaption></figcaption></figure>

CF(Checkoutform) technically consists of 2(two) basic steps as like [PWI](/en/payment-methods/paywithiyzico.md);

* [CF-Initalize](/en/payment-methods/checkoutform/cf-implementation/cf-initialize.md)
* [CF-Retrieve](/en/payment-methods/checkoutform/cf-implementation/cf-retrieve.md)

**CF-Initialize** is where we start the payment process.\
While **CF-Retrieve** step is retrieving payment result, simply.

### Implementation Steps

1. [Usage](#usage)
2. [CF - Initialize](/en/payment-methods/checkoutform/cf-implementation/cf-initialize.md)
3. Redirection
4. [CF - Retrieve](/en/payment-methods/checkoutform/cf-implementation/cf-retrieve.md)
5. [Webhook](/en/advanced/webhook.md)

### Top View

* [ ] Usage; decision making of payment form which is available in pop-up, responsive, iframe or redirection forms.
* [ ] CF-Initialize; first `POST` request of managing two-step CF transactions.
* [ ] Redirection; Following up consumers' payment, iyzico triggers correlated IPN(Instant Payment Notification) to given callbackUrl.
* [ ] CF-Retrieve; engage step to officialize transaction between Acquirer and Issuer.
* [ ] Webhook; real-time notification of relevant payment.

### UML Diagram

<figure><img src="/files/JKPkeOHQUHLcfHzwQ13q" alt=""><figcaption></figcaption></figure>

### Usage

CF(Checkoutform) offers multiple way of forms on the browsers;&#x20;

#### Responsive

```html
<div id="iyzipay-checkout-form" class="responsive"></div>
```

#### Pop-up

```html
<div id="iyzipay-checkout-form" class="popup"></div>
```

#### iFrame

* It requires to add `&iframe=true` postfix to `paymentPageUrl` parameter that returns after CF-Initialize request.

#### Redirection

* Most common method where direct routing of `paymentPageUrl` on the application.


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.iyzico.com/en/payment-methods/checkoutform/cf-implementation.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.