Taler (Payment)Payer (Shopper) BrowserPayer (Shopper) BrowserPayee (Merchant) SitePayee (Merchant) SiteTaler ExchangeTaler ExchangeTor/HTTPSHTTP/HTTPSEstablish Payment Obligationopt1Select Taler payment method (skippable with auto-detection)2Choose goods3Send signed digital contract proposalExecute Paymentopt4Affirm contract5Send payment6Forward payment7Confirm paymentFulfilment8Provide products or services