Taler (Payment)Payer (Shopper) BrowserPayer (Shopper) BrowserPayee (Merchant) SitePayee (Merchant) SiteTaler ExchangeTaler ExchangeTor/HTTPSHTTP/HTTPSEstablish ContractChoose goodsoptSelect Taler payment method (skippable with auto-detection)Send signed digital contract proposalExecute PaymentoptAffirm contractSend paymentForward paymentConfirm paymentFulfilmentConfirm paymentRequest fulfillment (if Web article)Provide product resource