# The Ratepay Gateway Operations

###### Ratepay supports the following operations for communicating payment information between the online shop and Ratepay Gateway.

## Checkout

Ratepay Gateway operations for checkout
Every checkout process and its subsequent actions (delivery and post-checkout changes) are identified by a unique transaction-id generated by the Ratepay Gateway during the Payment Initialization.

[Place order](/docs/developer/api_integration/payment_1.8/payment_api_documentation/the_ratepay_gateway_operations/place_order/payment_initialization)

## Follow-up operations

Ratepay Gateway operations for follow-up operations
Ratepay Gateway operations for follow-up operations

### CONFIRMATION_DELIVER

This is used to **inform us about the delivered items** of a transaction.
This activates the claim against the end customer and the payment due date begins.

### PAYMENT_CHANGE

With the PAYMENT_CHANGE you can submit changes of an order to us.
This operation is separated into different subtypes:

- Change Order,
- Cancellation,
- Return
- and Credit.


[Follow-up operations](/docs/developer/api_integration/payment_1.8/payment_api_documentation/the_ratepay_gateway_operations/follow_up_operations/payment_change)

## Instalment Calculator

Ratepay Gateway operations for instalment calculation
Ratepay Gateway operations for instalment calculation

- The Configuration Request allows to read the stored instalment configuration parameters for the used profile.
- The Calculation Request is called during the checkout process when customers experiment with the Instalment Calculator to configure their individual instalment plans. A transaction ID is not needed.


[Instalment Calculator](/docs/developer/api_integration/payment_1.8/payment_api_documentation/the_ratepay_gateway_operations/instalment_calculator/configuration_request)