Accepting online payments in Nepal means working with local gateways, bank switches, and user habits that differ from global card-first markets. A clean integration saves you from lost orders, duplicate charges, and reconciliation nightmares.

Know your payment options

Nepal supports several channels: domestic wallets like Khalti and eSewa, card payments through acquiring banks, mobile banking redirects, and sometimes international cards via global processors. Each has different fees, settlement times, and technical APIs. Map which channels your customers actually use before building.

Sandbox before production

Every reputable gateway offers a sandbox environment. Test successful payments, failed payments, timeouts, and user cancellations thoroughly. Sandbox behavior does not always match production exactly, but it catches the majority of integration bugs early.

The checkout flow

A typical flow: your server creates a payment request with a unique order ID and amount, the user completes payment on the gateway or via redirect, and your system receives confirmation. Never trust the client-side alone — always verify payment status server-side before fulfilling an order or unlocking a service.

Webhooks and callbacks

Gateways notify your server via webhooks when payment status changes. Your endpoint must be HTTPS, idempotent, and fast. Respond quickly with a 200 status, then process asynchronously if needed. Log every webhook payload for debugging disputes and reconciliation.

Handling failures gracefully

Payments fail for many reasons: insufficient balance, network timeout, user closing the browser, or bank downtime. Show clear error messages, let users retry without creating duplicate orders, and preserve cart state so they do not start over.

Idempotency keys

Use a unique idempotency key per payment attempt tied to your order ID. If a webhook arrives twice or a user double-clicks pay, your system should process the charge once and ignore duplicates. This prevents the worst class of payment bugs.

Reconciliation

Daily reconciliation compares your internal order records against gateway settlement reports. Mismatches happen — delayed settlements, partial refunds, or manual adjustments. Build an admin view that flags unreconciled transactions so finance can investigate promptly.

Refunds and partial refunds

Support full and partial refunds through the gateway API where available. Track refund status separately from the original payment and update order state accordingly. Users expect refunds to appear within stated timelines.

Security requirements

Never expose secret API keys in frontend code. All payment initiation and verification happens server-side. Use environment variables for credentials, rotate keys periodically, and restrict admin access to payment logs.

The takeaway

Reliable gateway integration is about server-side verification, idempotent webhooks, clear failure handling, and daily reconciliation — not just dropping a pay button on your site.

Hedztech integrates Nepal payment gateways into web and mobile products. See web development and FinTech software, or request an estimate.