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# FROM: https://github.com/w3c/webpayments/tree/gh-pages/PaymentFlows
@startuml
autonumber
Participant "Payee (Merchant) Site" as Payee
Actor "Payer (Shopper) Browser" as Payer
participant "Payer (Shopper) PSP (PayPal)" as CPSP
note over MPSP, CPSP: HTTPS
title PayPal Payment (REST API) (Current)
Payee->Payer: Present Checkout Page with Pay Button
Payer->Payer: Select PayPal Payment Method
Payer-\Payee: Payment Page Request
Payee<->CPSP: Create Payment
Payee-/Payer: HTTP Redirect
Note right: HTTP Direct now send the shopper to the PayPal site
Payer-\CPSP: Payment Initiation
CPSP-/Payer: Authentication Page
Payer-\CPSP: Authenticate
note right: Typically a username & password
CPSP-/Payer: Payment Page
opt
Payer<->CPSP: Instrument Choice
note right: Payer can change from default payment instrument
end
Payer->Payer: Approval
Payer-\CPSP: Payment Approval
CPSP-/Payer: Payment Response Redirect
Payer-\Payee: Payment Response
Payee<->CPSP: Execute Payment
Payee-/Payer: Result Page
... asynchronous notification ...
CPSP->Payer: Payment Notification (email)
Opt
Payee->Payer: Payment Notification (email)
End
Note right: Provides out of band confirmation to protect against failure/modification at browser
@enduml
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