Refined SEPA Credit Transfer to add the web interactions

PaymentFlows/CreditTransfer/WebInitiatedSEPACreditTransfer-Current.pml

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+@startuml
+Autonumber
+
+participant "Payee (Merchant) Bank" as MB
+Participant "Payee (Merchant) PSP" as MPSP
+Participant "Payee (Merchant) Site" as Payee
+Actor "Payer (Shopper) Browser" as Payer
+participant "Payer (Shopper) Bank" as CB
+
+
+note over MPSP, Payer: HTTPS
+
+title PSP Mediated (SEPA) Credit Transfer (Current)
+
+Payee->Payer: Basket Page with Pay Button
+Payer->MPSP: Press Pay
+
+MPSP->Payer: Payment Method Choice Page
+Payer->MPSP: Select Credit Transfer
+MPSP->Payer: Provide Bank Transfer Details (e.g. IBAN)
+Payer->MPSP: OK
+MPSP->Payer: Result Screen "Pending Transfer"
+
+MPSP-[#black]>Payee: Payment Notification (Pending)
+
+group ISO20022 SEPA Transfer
+	Payer -[#green]> CB: CustomerCreditTransferInitiation
+	CB -[#green]> Payer: CustomerPaymentStatusReport
+	CB -[#green]> MB : FIToFICustormerCreditTransfer
+	MB -[#green]> MPSP : BankToCustomerDebitCreditNotification
+end 
+
+MPSP-[#black]>Payee: Payment Notification (Cleared)
+Payee-[#black]>Payer: Payment Notification (email)
+
+@enduml