Swimlanes.io is a free webapp for making sequence diagrams. You simply edit the text on the left and the diagram is updated in real time. You can download your sequence diagrams as images or distribute with a link.
Title: T-Chain: App to App _: **1. DEPOSIT FLOW** User -> Merchant App: purchase items Merchant App -> Merchant App Server: request to create order Merchant App Server -> Merchant App: return order_id Group: SDK: call deposit(order_id, amount, currency...) Merchant App -> Tokoin Server: generate code `generate_qrcode(order_id, amount, currency, chain_id)` Tokoin Server -> Merchant App: return qr_code Merchant App -> My T-Wallet: send deeplink (`qr_code`, `bundle_id`) My T-Wallet -> User: show order sumary User -> My T-Wallet: make payment My T-Wallet -> Merchant App: return result end Merchant App -> User: show purchase result