@startuml
' This is a PlantUML diagram, see https://plantuml.com/

autonumber

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)

== Order Creation/Claiming ==

Payer->Payee: Choose product(s) to buy on merchant's Website

Payee->Payee: Create order

Payee->Payer: Send taler://pay URI that identifies order

Payer->Payee: Claim order ownership with nonce

Payer->Payer: Display contract terms

== Payment Execution ==

Payer->Payer: Confirm payment

Payer->Payee: Send payment

Payee->Exchange: Forward payment

Exchange->Payee: Confirm payment

Payee->Payer: Confirm payment

== Fulfilment ==

Payer->Payee: Navigate to fulfillment URL

Payee->Payer: Provide product resource
@enduml