Redirect Flow

Before starting a transaction, the merchant must configure the callback URL in their profile. After the customer completes payment, CellPay UPG redirects the customer to the page routed through that callback URL.

Flow Diagram

┌────────────────┐       ┌──────────────────┐       ┌─────────────────────┐
│ Customer /     │       │ Your Backend     │       │ CellPay UPG         │
│ Browser        │       │ Server           │       │ + Provider          │
└───────┬────────┘       └────────┬─────────┘       └──────────┬──────────┘
	│                         │                             │
	│                         │ 1. Configure callback URL  │
	│                         │    in merchant profile     │
	│                         │────────────────────────────►
	│                         │                             │
	│ 2. Opens checkout page  │                             │
	│─────────────────────────►                             │
	│                         │                             │
	│                         │ 3. POST /upg/checkout      │
	│                         │    with callback URL       │
	│                         │────────────────────────────►
	│                         │                             │
	│ 4. Checkout page        │                             │
	│    opens for customer   │◄────────────────────────────
	│                         │                             │
	│ 5. Completes payment    │                             │
	│─────────────────────────────────────────────────────►
	│                         │                             │
	│                         │                             │ 6. Transaction completed
	│                         │                             │
	│ 7. Redirects customer   │                             │
	│    to callback URL      │◄────────────────────────────
	│                         │                             │