Documentation Index¶
The following specifications detail tap-to-pay and related flows for the SAGIO merchant POS (apps/terminal) and customer wallet.
| Doc ID | Title | Description |
|---|---|---|
| 001 | Feature Overview | High-level architecture, user flows, and the "Reverse Tap" concept. |
| 002 | Security | Threat model, data minimization, and skimming mitigations. |
| 003 | FASSTAP Configuration | How the merchant POS receives Worldline / Soft Space SDK credentials from the SAGIO API. |
| 004 | FASSTAP Visual Architecture | Mermaid diagrams of the system map, bootstrap flow, config provisioning, and transaction lifecycle. |