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@startuml
Actor "Payer (Shopper) Browser" as Payer
Participant "Payee (Merchant) Site" as Payee
Participant "Taler Exchange" as Exchange
note over Payer, Payee: Tor/HTTPS
note over Payee, Exchange: HTTP/HTTPS
title Taler (Payment)
== Establish Contract ==
Payer->Payee: Choose goods
opt
Payer->Payer: Select Taler payment method (skippable with auto-detection)
end
Payee->Payer: Send signed digital contract proposal
== Execute Payment ==
opt
Payer->Payer: Affirm contract
end
Payer->Payee: Send payment
Payee->Exchange: Forward payment
Exchange->Payee: Confirm payment
== Fulfilment ==
Payee->Payer: Confirm payment
Payer->Payee: Request fulfillment (if Web article)
Payee->Payer: Provide product resource
@enduml
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