Developers

    Build every retail financial product on one REST API.

    A single, well-documented REST API for every product on the CellPay rail — bill payments, top-ups, gift cards, prepaid card issuance, activations, and cash services. Sandbox in minutes, production in days.

    Developer Experience

    Everything you'd expect —
    and then some.

    • REST + JSON. Idempotency keys on every write.
    • Webhooks for every state transition — settlements, disputes, refunds.
    • Full sandbox with realistic test billers, carriers, and card brands.
    • TypeScript, Python, and Node reference clients.
    • Dedicated integration engineer for every partner.
    • Compliance-in-the-loop: KYC, AML, and screening are handled by the API.
    POST /v1/bill-payments
    POST /v1/bill-payments
Authorization: Bearer sk_live_...

{
  "biller_id": "utl_1234",
  "account_number": "9876543210",
  "amount_cents": 12500,
  "customer": { "name": "Jane Doe" }
}

    Product Endpoints

    Every product. One namespace.

    POST/v1/bill-payments
    POST/v1/topups
    POST/v1/gift-cards
    POST/v1/prepaid-cards
    POST/v1/activations
    POST/v1/smart-safe/deposits

    Ready to start building?

    Request sandbox access