# Credential-on-file \(COF\) purchases {#en_Gate__payments_on_saved_data .concept}

Articles about registering and processing via Gate different types of purchases followed by a series of recurring debits and about the capabilities of managing debits within recurring payments.

**Note:** This subsection covers processing COF purchases via Gate and describes requests and callbacks that are used in case of card payments.

In addition, use the following materials to gain a fuller understanding of processing COF purchases:

-   articles [On-demand COF purchase](en_platform_recurring_model.md) and [COF purchase with automatic debiting](en_platform_sheduled_recurring_model.md) in the section [Payment processing](en_platform_payment_model.md) that provide a general description of processing COF purchases in the Ecommpay payment platform and cover information about operations utilised to execute a payment of this type and statuses that are assigned to the payment and the operations performed within it.
-   articles of the [Payment methods](en_pm_about.md) section containing a description of processing COF purchases via Gate with the focus on the specific features of the payment method used and information about relevant requests and callbacks.

In this article:

-   [Overview](en_Gate__saved_cards_payments_type.md)
-   [Registering COF purchase](en_gate_payment_recurring_registration.md)
-   [On-demand COF purchase](en_Gate__cof_merchant_side.md)
-   [COF purchase with automatic debiting](en_Gate__cof_gate_side.md#)
-   [Managing debiting series of a COF purchase](en_gate_payment_recurring_manage.md)
-   [Working with debiting retry attempts](en_gate_cof_retry_attempts.md#)

-   **[Overview](en_Gate__saved_cards_payments_type.md)**  
An article with the general information about recurring purchases, their classification, and processing workflows.
-   **[Registering COF purchase](en_gate_payment_recurring_registration.md)**  
An article about registering via Gate purchases followed by series of recurring debits.
-   **[On-demand COF purchase](en_Gate__cof_merchant_side.md)**  
An article about processing via Gate recurring purchases with debiting of funds initiated by the merchant \(unscheduled\).
-   **[COF purchase with automatic debiting](en_Gate__cof_gate_side.md#)**  
An article about processing via Gate recurring purchases with automatic debiting of funds \(according to a set schedule\).
-   **[Managing debiting series of a COF purchase](en_gate_payment_recurring_manage.md)**  
An article about the capabilities of managing debiting series of recurring purchases via Gate, including retrieval of information about the debiting series, updating its parameters, and canceling the recurring purchase.
-   **[Working with debiting retry attempts](en_gate_cof_retry_attempts.md#)**  
An article about working with the automatic debiting retries as part of processing a recurring purchase.

**Parent topic:**[Gate](en_Gate_Integration_About.md)