All external system integrations with direction and timing.
| System | API | Direction | When |
|---|---|---|---|
| LexisNexis IDU | Identity verification | Website → LexisNexis | Phase 4 — after payment |
| SignatureRx | Create Prescription | Website → SignatureRx | Phase 7 — prescriber approves POM |
| SignatureRx | Signed Rx webhook | SignatureRx → Website | Phase 7 → triggers Phase 8 (GP letter + patient msg + pharmacy queue) |
| Royal Mail | Create Shipment | Website → Royal Mail | Phase 11 — after order packed |
| Royal Mail | Tracking webhook | Royal Mail → Website | Phase 12 — delivery updates |
| TitanPMR | Patient data push | Website → TitanPMR | Phase 9 — after order confirmed |
| Stripe | Full capture / first instalment | Website → Stripe | Phase 3 — after plan selection |
| Stripe | Recurring instalment charge | Stripe → auto-charge | Phase 13 — monthly for instalment plans |
| Stripe | Refund confirmation webhook | Stripe → Website | After team issues refund |