1.6. Preauth Form, Capture and Cancel

Introduction

Preauthorization is a transaction type in which bank blocks the specified amount in the Payer’s card account and does not allow the cardholder to use this blocked money. It is important to know that the block remains for a definite period of time depending on whether this is a debit or a credit card (usually the maximum block period is 7 days for debit cards and 28 days for credit cards). Preauth Form integration allows Connecting Party to exclude itself from storing, processing, or transmitting Payer’s cardholder data or other sensitive payment details. Such data is submitted by Payer on Denumtech hosted payment form in PCI DSS certified environment.
Capture is a transaction followed after preauth which deducts the locked amount from Payer’s card.
Cancel is opposite of Capture which cancels the deduction and returns locked amount back to Payer’s card.
All forms can be customized. Follow the Forms Customization reference to see examples and macros of Payment Page Customization, Prefilled Cardholder Data in Payment Page, Wait Page Customization and Finish Page Customization.

See terms definitions in Glossary.

Preauth Form Flow

skinparam roundcorner 20 skinparam sequenceArrowThickness 2 skinparam ParticipantPadding 30 actor Payer as Customer participant "Connecting Party\nwebsite" as Merchant participant "Payment Gateway" as g autonumber Customer -> Merchant: Checkout activate Merchant == Purchase payment request == Merchant -> g: api/v2/preauth-form activate g g --> Merchant: Redirect-url, orderId deactivate g Merchant -> Customer: Provide redirect-url \nto payer’s browser deactivate Merchant activate Customer Customer -> g: GET redirect-url deactivate Customer activate g g --> Customer: Payment Form deactivate g activate Customer Customer -> g: Submit form deactivate Customer activate g g --> g: Process payment == Final redirect of customer == g -> Customer: Connecting Party website redirect_url activate Customer Customer -> Merchant: POST redirect_url\nstatus, orderid deactivate Customer activate Merchant group Get Final Status == Receive Connecting Party Callback == Merchant <- g: Сallback with final status g <-- Merchant: HTTP 200 deactivate g == Order Status Request == Merchant -> g: api/v2/status activate g g --> Merchant: Response \nstatus, order-stage deactivate g end Merchant -> Customer: Show result deactivate Merchant

(2) To implement preauth-form request see /api/v2/preauth-form/.
(9) To implement final redirect see Final Redirect.
(11,12) To implement order status request see /api/v2/status/. Status should be requested multiple times with 3-5 seconds interval until final status will be received in response.
(13) To implement callback with final status handling see Connecting Party.

Capture Flow

skinparam roundcorner 20 skinparam sequenceArrowThickness 1 skinparam maxmessagesize 100 skinparam sequenceParticipant underline actor Payer participant "Connecting party" as A participant "Payment Gateway" as B hnote over A,B : Successful Preauth Transaction autonumber group Optional Payer -> A: Initiate Capture activate A end == Capture == A -> B: api/v2/capture activate B B --> A: Order ID B -> B: Process Capture group Get Final Status == Receive Connecting Party Callback == A <- B: Callback with Final Status A --> B: HTTP 200 deactivate B == Order Status Request == A -> B: Get Status by Order ID api/v2/status activate B B --> A: Response with Status, Order-stage deactivate B end group Optional A --> Payer: Final Status deactivate A end

(1) Capture can be initiated by Connecting Party based on internal business model or Payer’s request.
(2) To implement capture request see /api/v2/capture/.
(5) Callback for Capture will be sent only if notify_url was provided in initial transaction request or additional callback URL for Capture transactions is specified on the endpoint level. If server_callback_url was provided in initial transaction request, callback for Capture will not be sent. To implement callback with final status handling see Connecting Party Callbacks.
(7) To implement order status request see /api/v2/status/. Status should be requested multiple times with 3-5 seconds interval until final status will be received in response.
(9) Final Status can be sent by Connecting Party based on internal business model or by Payer’s request.

Cancel Flow

skinparam roundcorner 20 skinparam sequenceArrowThickness 1 skinparam maxmessagesize 100 skinparam sequenceParticipant underline actor Payer participant "Connecting party" as A participant "Payment Gateway" as B hnote over A,B : Successful Preauth Transaction autonumber group Optional Payer -> A: Initiate Cancel activate A end == Cancel == A -> B: api/v2/return activate B B --> A: Order ID B -> B: Process Cancel group Get Final Status == Receive Connecting Party Callback == A <- B: Callback with Final Status A --> B: HTTP 200 deactivate B == Order Status Request == A -> B: Get Status by Order ID api/v2/status activate B B --> A: Response with Status, Order-stage deactivate B end group Optional A --> Payer: Final Status deactivate A end

(1) Cancel can be initiated by Connecting Party based on internal business model or Payer’s request.
(2) To implement cancel request see /api/v2/return/.
(5) Callback for Cancel will be sent only if notify_url was provided in initial transaction request or additional callback URL for Cancel transactions is specified on the endpoint level. If server_callback_url was provided in initial transaction request, callback for Cancel will not be sent. To implement callback with final status handling see Connecting Party Callbacks.
(7) To implement order status request see /api/v2/status/. Status should be requested multiple times with 3-5 seconds interval until final status will be received in response.
(9) Final Status can be sent by Connecting Party based on internal business model or by Payer’s request.