Skip to main content
GullySystem

Payment Gateway Integration

Payment gateway integration connects checkout to cards, bank transfers, wallets, cash on delivery with your own rules, and payment links for phone orders. Reconciliation of settlements against orders is part of the scope.

Payment received, order not confirmed

A buyer may pay by bank transfer and see the debit, while the store still shows the order as pending. That usually means a gateway callback was not handled. The integration treats callbacks as a core part of checkout.

Webhook handling

Gateway callbacks are recorded, verified and processed even when they arrive twice, out of order, or an hour late because of a poor network connection at either end.

Status checked both ways

The store also asks the gateway about payments still pending. Both paths lead to the same order.

No double charging

A retry on a weak connection cannot create a second payment for the same order.

Payment methods your buyers use

Checkout offers the methods your customers use and restricts the ones your business cannot carry.

The most used method placed first on a phone

It is the method most buyers reach for, so it sits where a thumb lands, not lower in a list.

Cash on delivery with limits

Eligibility can depend on order value, product and postal code history, and a confirmation call or message is required before any parcel is booked for dispatch.

Part payment and advance

Made-to-order goods can take a token advance, with the balance collected by link before dispatch.

Links for offline orders

An order taken on the phone becomes a payment link on WhatsApp. The payment shows up on that order, so nobody has to match it by hand.

Reconciliation of settlements

Gateways settle in batches, net of charges, a day or two later. Matching each settlement to its orders is manual work in many accounts teams.

Settlement against orders

Each payout is matched to the orders it covers, and the gateway fee and the tax charged on that fee are shown separately for your accountant to book.

Refunds tracked to completion

A refund is followed until the gateway confirms it. Pending refunds stay on a list.

Failed payment recovery

After an abandoned payment, one message can carry a link back to the same order and let the buyer complete it.

FAQ

Frequently asked questions

Which payment gateways do you integrate?

Stripe, PayPal and Adyen most often, and others where you already hold an account. The merchant account stays in your business name and settlements go to your bank directly.

Can we offer cash on delivery only in some areas?

Yes. Eligibility can depend on postal code, order value, product and a customer’s return history. The rules sit in the admin screen for you to change.

What happens to a payment that fails at the bank?

The order stays in a clear pending state and the buyer sees what happened. A link lets them try again. Nothing is confirmed until the gateway reports the money moved.

Talk to us

Tell us what you need.

Share your requirements and one of our engineers will come back to you within one business day.

What happens after you share your requirements

  1. A senior engineer reads your answers. Nobody phones first.
  2. Within one business day you get a written note: what we understood, what we would start with, and the questions we still have.
  3. If it fits, a proposal follows with the order of work, what we need from you and what you receive at each step.
  4. No call is booked and nothing is paid until you have read the note. Your details stay with us.

Start with your requirements

Seven short steps that tell us what you need. A senior engineer reads them before anyone gets in touch.

Share your requirements