Gateway selection
A side-by-side look at fees, countries, payment methods, and platform fit, with one clear recommendation.
The Problem
A Connected Gateway Is Not the Same as a Working Checkout
Payments fail quietly. Orders stay unpaid, buyers give up at a declined card, and you notice only when month-end revenue comes in short.
01 · Missing methods
A Kuala Lumpur buyer leaves because checkout doesn't take FPX.
The gateway gets picked for how your buyers want to pay.
02 · Unpaid orders
A webhook times out, and a paid order sits unpaid.
Webhooks update each order when a payment succeeds, fails, or refunds.
03 · Double charges
A double-click charges a customer twice.
Idempotency keys stop retries and double-clicks from charging again.
04 · Hidden errors
Your plugin hides errors, so nobody knows which failures are real.
Declines, refunds, and failures get tested in the sandbox first.
A buyer in Kuala Lumpur tries to pay with FPX online banking, but your checkout only takes cards, so they leave. Another customer pays by card, the webhook times out, and the order sits unpaid while they wait for a confirmation email. A double-click charges someone twice, and your team spends an afternoon refunding by hand. Your plugin hides its error details, so nobody knows which failures are real.
We start with how your buyers want to pay, then pick or confirm the gateway that fits your markets and fees. We connect it through its official API or plugin and handle webhooks for every payment event. On custom builds, each charge carries an idempotency key, so a retry can't charge twice. Then we test declines, refunds, and failures in the sandbox. Payments reach your orders on their own, not after a manual check.
Payments matched to orders
Webhooks update each order when a payment succeeds, fails, or gets refunded.
One charge per order
Idempotency keys stop retries and double-clicks from charging a card twice.
Card data kept off your server
Hosted fields or a redirect send card numbers straight to your provider.
Our Gateway Integration Process
From Gateway Choice to Live Payments in Five Steps
You see the gateway choice, the payment flow, and every test result before a real customer pays. Nothing moves forward without your sign-off.
We look at your platform, markets, payment methods, and any gateway you already use. If your current gateway just needs a setting changed, we'll tell you before we quote. Otherwise, a short plan and a fixed price follow.
What's Included
What You Get From Our Payment Integration Services
Every ecommerce payment integration we deliver covers gateway choice, API or plugin setup, the checkout, webhooks, sandbox tests, and a handover.
Compare Options
DeveloperLook vs a Plugin Alone vs an In-House Build
Plugins install fast and cost little, and an in-house build gives full control. Here's where each option holds up when payments really matter.
| Feature | DeveloperLookBest fit | Plugin alone | In-house team |
|---|---|---|---|
| Upfront cost | From $750, fixed scope | Free to low | Salaried dev time |
| Time to launch | 3 days to 6 weeks | Same day | Weeks to months |
| Gateway choice | Matched to your markets | What the plugin supports | Your own research |
| Webhooks and order sync | Built and tested | Basic, varies | You build it |
| Duplicate charges | Blocked with idempotency | Depends on the plugin | Depends on design |
| Multiple gateways | One checkout, routed | One per plugin | Extra build time |
| Testing before launch | Sandbox, every scenario | Your own checks | Your QA process |
| Your team's time | Low, we handle it | Low to medium | High |
DeveloperLook
Plugin alone
- Upfront cost
- DeveloperLook: From $750, fixed scopePlugin alone: Free to low
- Time to launch
- DeveloperLook: 3 days to 6 weeksPlugin alone: Same day
- Gateway choice
- DeveloperLook: Matched to your marketsPlugin alone: What the plugin supports
- Webhooks and order sync
- DeveloperLook: Built and testedPlugin alone: Basic, varies
- Duplicate charges
- DeveloperLook: Blocked with idempotencyPlugin alone: Depends on the plugin
- Multiple gateways
- DeveloperLook: One checkout, routedPlugin alone: One per plugin
- Testing before launch
- DeveloperLook: Sandbox, every scenarioPlugin alone: Your own checks
- Your team's time
- DeveloperLook: Low, we handle itPlugin alone: Low to medium
Projects We've Built
Ecommerce and Payment Projects We Have Built
A selection of stores, finance sites, and web apps we've built. Payment flows are only as reliable as the systems around them.
Oasic Finance SaaS Web Design & Development
- Finance
- SaaS Platform
- Dashboard
Envitis Investment Website Design & Development
- Finance
- Dashboard
- Website
Moneywish Finance App Design & Development
- Finance
- Dashboard
- Mobile App
Finto Corporate Website Design & Development
- Finance
- Dashboard
- Website
What Our Clients Say
What Clients Say After Launch
Feedback from teams we have built online stores, checkouts, and payment flows for.
We were getting plenty of traffic, but far too many people were leaving at checkout. The buying process had simply become too complicated. The team took the time to understand where customers were dropping off, then rebuilt the checkout flow and cleaned up the shopping experience. What I really appreciated was that they didn’t just make the store look better, they actually solved the problems that were costing us sales. The whole store feels faster, simpler, and much easier to buy from now. Exactly what we needed.
We had a different kind of problem. People were visiting the store, adding products to their carts, and then disappearing before they finished the order. We had tried a few apps and made changes here and there, but nothing really seemed to solve the bigger issue. The team went through the shopping experience with us and pointed out things we hadn't really noticed ourselves. They cleaned up the cart and checkout flow, made the mobile experience much smoother, and helped us make the store feel easier to shop. I’m not going to pretend we fixed everything overnight, but it finally feels like the store is helping the sale instead of getting in the way of it.
Our old store was making it way too difficult for people to find products. We had a large catalogue, but the search, filters, and mobile navigation were frustrating customers. The team completely changed how the store handled product discovery and made the experience much easier to use on mobile. I was especially impressed by how much thought went into the customer journey rather than just the visual design. They understood what we were trying to achieve and turned it into a store that actually feels built for our customers. We’re genuinely proud of the result.
1,000+
Projects shipped
10+
Years of experience
Top 3%
Upwork Top Rated Plus
5 stars
Average review score
Work Culture
Why Teams Pick Us as Their Payment Gateway Integration Company
Payments are the one part of a site nobody forgives when it breaks. Here's how we build them, from one gateway to a full custom flow.
Every payment event handled
Stripe retries failed webhook deliveries for up to three days, and events can arrive twice or out of order. We log event IDs, so each event updates your order once.
One charge, even on retries
Stripe's docs say a reused idempotency key returns the first result. We use that on custom builds, so a timeout or double-click can't charge anyone twice.
Local methods, not just cards
FPX online banking is a common way to pay in Malaysia, and wallets matter elsewhere. We add the methods your markets expect next to cards.
Credentials handled carefully
API keys live in environment settings, not in code, and live keys stay out of test runs. You get notes on rotating them when your team changes.
Straight answers on fees
Processing fees and approvals come from your provider, not from us. We show you how gateways compare on fees before you pick one.
Your accounts, your code
Gateway accounts, keys, and integration code stay in your name. If you switch developers or gateways, nothing is locked to us.
Overview
What do payment gateway integration services include?
DeveloperLook provides payment gateway integration services for websites, online stores, and web apps. We connect Stripe, PayPal, Braintree, or a local gateway, build the checkout and webhooks, and test payments, declines, and refunds in the sandbox. Projects start at $750, and a single gateway goes live in 3 to 7 business days.
DEVELOPERLOOK
Project facts · Payment Gateway Integration
- Service
- Payment gateway integration services (gateway choice, checkout, webhooks, testing)
- Typical timeline
- 3 to 7 business days for one gateway, 2 to 6 weeks for custom flows
- Platforms
- WooCommerce, OpenCart, WordPress, custom sites, and web apps
- Built with
- Stripe, PayPal, and Braintree APIs, webhooks, PHP, and Node.js
- Experience
- 10+ years of development experience and 1,000+ shipped projects
- Post-launch support
- 30 to 90 days, depending on plan
- Communication
- Calls in US, UK, and AU business hours
- Starting price
- From $750 USD, fixed scope after a free checkout review
Reviewed 28 Sep 2026 by Saimul Islam
Good fit
Stores whose payments fail quietly
Your gateway is connected, but some orders stay unpaid because a webhook failed, and nobody notices until month-end.
WooCommerce stores adding a gateway
Your WooCommerce store needs a third-party gateway, and the plugin you tried doesn't show up in the block checkout.
Startups building a web app
You need payment gateway API integration services for a new product, with saved cards and refunds built in from day one.
Sellers in more than one market
You sell to buyers in the US and Malaysia, and you need Stripe or PayPal next to local options like FPX online banking.
Agencies without payments developers
Your agency needs payment gateway integration developers who can deliver a client's checkout under your brand, with clean handover notes.
Not a fit
Wallets only
You only need Apple Pay, Google Pay, or Shop Pay switched on. Our Digital Wallet & Express Checkout Integration service handles wallets.
Marketplace split payouts
You need split payouts to sellers on a marketplace. Our Stripe Connect Marketplace Payouts service is built for that.
Recurring billing
You need subscription plans and recurring billing. Our Subscription Management Software & Recurring Billing Integration service covers those.
Lower fees or approval
You want lower processing fees or help getting approved. Those depend on your provider, not the integration, and our projects start at $750.
Not sure we're the right fit?
Send a two-line brief. We'll tell you honestly whether we're the right team.
Pricing
Transparent Starting Prices for Gateway Work
These are starting points in USD. Your final price depends on your platform, the number of gateways, and any custom payment flows, and you get a fixed proposal after a free checkout review.
For a website or store that needs one gateway, such as Stripe or PayPal, connected and tested.
$750one-time, USD
- One gateway through its API or plugin
- Hosted card fields or a redirect
- Webhooks and order status sync
- Sandbox tests for payments and refunds
- 30 days post-launch support
Recommended
For businesses selling in two markets that need local and international ways to pay.
$1,500one-time, USD
- Everything in Single Gateway
- Two gateways in one checkout
- Routing by country or currency
- Local methods such as FPX
- Payment reconciliation report
- 60 days post-launch support
For web apps and stores needing deposits, invoices, saved cards, or three or more gateways.
$5,200one-time, USD
- Everything in Two-Gateway Checkout
- Three or more gateways
- Deposits, invoices, and payment links
- Saved cards and partial captures
- Admin view for payments and refunds
- 90 days post-launch support
For Agencies
White-Label Gateway Work for Agencies and Studios
Your client and their site stay with you. We handle the gateway choice, API work, and sandbox testing behind the checkout, then hand everything over under your brand with clear go-live notes.
How the partnership works
White label: your client only ever sees your brand
- Your client
- You, the agency
- DeveloperLook
Share the platform
Send the platform, markets, and any gateway your client already uses.
- Client needs
- You share the details
- Details received
We scope and quote
You get a gateway recommendation, a price, and a timeline to approve.
- Scope and plan
- Proposal to resell
- Your quoteYOUR LOGO
Test and hand over
We build, test in the sandbox, and hand over go-live steps under your brand.
- Done by our team
- Your brand on it
- Handed to your clientDone
Partner with DeveloperLookDelivered under your brand
Stay client-facing
Your client sees your brand, while we do the payments work.
Predictable delivery
A gateway plan, a fixed price, and sandbox results before launch.
Payments specialists
Webhooks, refunds, and duplicate-charge edge cases handled without hand-holding.
Flexible capacity
Bring us one client's gateway or a queue of checkout projects.
The Right Technology for Your Project
Technology Stack
We connect gateways through their official APIs, SDKs, or plugins and build on the stack your site already runs.
Stripe
PayPal
Braintree
Apple Pay
Google Pay
WooCommerce
WordPress
Magento
BigCommerce
PHP
Laravel
Node.js
Python
React
Next.js
Vue.js
JavaScript
FAQ
Frequently Asked Questions
Straight answers on gateway costs, timelines, WooCommerce and OpenCart setups, wallets, and PCI scope.
Saimul IslamFounder & CEO, DeveloperLookStill have questions?
Send a message or book a call with the team.
Our gateway work starts at $750 for one gateway, connected, tested, and live. Two gateways in one checkout, with routing and local methods like FPX, cost $1,500. Custom flows such as deposits, invoices, and saved cards start at $5,200. Your provider's processing fees are separate and paid to them.
One gateway on a standard setup takes 3 to 7 business days, including sandbox tests. Two gateways in one checkout take 1 to 2 weeks. Custom payment flows take 2 to 6 weeks, and a merchant account approval on the provider's side can add a few days.
You pick a gateway, get API keys from its dashboard, connect its API, SDK, or plugin, and build the checkout. Then you set up webhooks so payment results reach your orders, and test every case in the sandbox before switching to live keys. We can do each step on the site you already have.
You install the gateway's WooCommerce plugin, or we build one on WooCommerce's gateway class. Check that it supports the Checkout block, the default for new stores since WooCommerce 8.3, or it won't show there. We test orders, refunds, and webhooks on a staging copy first.
In OpenCart, gateways are extensions: you upload the module in the Installer, then install and configure it under Extensions with the Payments type. If your gateway has no module, we build one with its API. We test it on a copy of your store, because extension conflicts can break checkout.
Wallets run on top of your gateway, so you usually switch them on in its dashboard instead of adding a new provider. Stripe and Braintree, for example, take Apple Pay and Google Pay through the same API as cards. Apple Pay on the web also needs your domain registered with Apple.
We most often integrate Stripe, PayPal, and Braintree, plus Malaysian options such as Billplz, iPay88, Toyyibpay, and FPX online banking. Any gateway with a documented API can work. We compare fees, supported countries, and payment methods for your markets before you commit to any of them.
Yes, when card numbers go straight to the provider through hosted fields or a redirect, your PCI scope stays small. Your servers don't see or store raw card data. Full compliance still covers how your business runs, so we list what stays on your side, such as your provider's yearly questionnaire.
Yes, every project gets a full sandbox run before live keys go in. We test successful payments, declines, refunds, duplicate submissions, and failed webhooks, then confirm one small live payment at launch. You see the results first, so no customer is charged while we work.
You own everything: the merchant account, API keys, and all the code we write. Keys live in your environment settings, and we hand over notes on rotating them. If you change developers or gateways later, nothing is locked to us, and your support window covers fixes after launch.
Saimul IslamFounder & CEO, DeveloperLookStill have questions?
Send a message or book a call with the team.
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