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From $5,000
Single gateway live in 4 weeks
API · Hosted · Mobile SDK

Custom Payment Gateway Integration for Apps & Platforms

Your product is built or halfway there, and now it needs to take payments. We plug Stripe, PayPal, Adyen, Braintree and 50+ local gateways straight into your web and mobile apps, with security handled from the first sprint instead of patched on later.
What you get:
PCI-DSS compliance by design. Tokenization and hosted fields keep card data off your servers, so your audit scope stays small.
API, hosted or mobile SDK integration. We choose the integration method that fits your checkout and your PCI scope.
Multi-gateway routing with fallback. Payments keep flowing even when one payment gateway provider has an outage.
One partner for product and payments. We own the integration end to end and watch transactions after go-live.

Our expertise in numbers

550+
projects delivered
70%
of clients return for a second project
210+
specialists on the team
10+
years in the market — not a single unfinished project
Clutch Top Developers 2024
4.9 on Clutch (44 reviews)
Best Design Award 2023
Clutch Top Developers 2024
4.9 on Clutch (44 reviews)
Best Design Award 2023
Clutch Top Developers 2024
4.9 on Clutch (44 reviews)
Best Design Award 2023

Who we help

We add payments to products that are already live or close to launch, from startups to companies with their own engineering teams. It is part of our financial app development work.

Founders and product teams

For teams launching a new product and adding payments for the first time, often before a funding round, with no time to run a compliance project in parallel.
Working with us, you:
Go live with a single gateway in 4 weeks, hosted checkout and card data off your servers
Keep PCI scope at SAQ-A with hosted fields and tokenization, no audit project required
Add subscriptions and recurring billing if your product runs on a subscription model
Lean on 9+ years in fintech and 300+ shipped projects instead of figuring payments out alone
Get one team for product and payments, so integration is not a separate vendor to manage

CTOs and engineering leaders

For teams that already have a product and an in-house team, and need payment work done right: a clean integration, a migration, or multi-gateway orchestration.
Working with us, you:
Add a direct api integration with tokenization, idempotency and reconciliation built in
Run multiple payment gateways with routing and fallback, so an outage does not cost you revenue
Migrate off your current provider with dual-running and no downtime for live payments
Get security by design, real PCI-scope reduction, not a promise to help with compliance later
Keep post-launch coverage: transaction monitoring, reconciliation and support after go-live

E-commerce, marketplaces and on-demand

For revenue products that move money between many parties: online stores, marketplaces with sellers and payouts, and on-demand apps charging users in real time.
Working with us, you:
Add ecommerce payment gateway integration with the checkout and methods your buyers expect
Run marketplace split payments, escrow and seller payouts on top of your existing flow
Charge inside mobile apps with Apple Pay and Google Pay for on-demand and gig products
Accept multi-currency and local payment methods for the markets you sell in
Connect wallets and alternative payment methods as your product grows

AND EVERYONE ELSE

If your scenario isn't listed above, that doesn't mean we can't help.
Fill a form and you'll get:
Payment integration scoping in 3 days: architecture, gateway list and estimate
A review of your current checkout and where payments can be added or improved
Integration recommendations for your existing stack, gateways and PCI scope
Signed NDA before the first call

Payment gateway integration services we deliver

We match the integration method to your product, your checkout and your PCI scope. It is part of our fintech software development practice.

Want to start taking payments without owning card data

The fastest way to go live is a hosted or redirect checkout, where the provider hosts the payment page and the card data never touches your servers. That keeps you in the lightest PCI scope (SAQ-A) and gets a single gateway live in weeks.
Show details
When this is relevant:
You need online payments live in weeks, not quarters
You want to keep card data and PCI scope off your backend
A standard checkout covers most of your use cases
Your team has no time to run a full compliance project
Our approach:
Hosted, redirect or iframe, chosen by how much control and design you need
Gateway connected and webhooks mapped to your backend
Success, failure and refund paths tested in sandbox first
Documented setup handed over for your team to maintain
What you get:
A hosted or iframe checkout live fast, card data on the provider side
The lightest PCI scope (SAQ-A), so audits stay simple
A payment page styled to match your product, not a generic form
Webhooks wired to your order and account logic

Want full control over the checkout and the payment data

Direct API integration through REST and SDK gives you a fully branded checkout and control over every step. It puts you in a wider PCI scope (SAQ-D), so we design tokenization and data flow before writing a line of code.
Show details
When this is relevant:
You need a fully branded, on-page checkout with no redirects
You route or store payment data through your own systems
You need fine control over retries, webhooks and reconciliation
Hosted flows are too rigid for your product
Our approach:
Data flow mapped and PCI scope fixed before development starts
API integration built with tokenization from the first commit
Idempotency keys and a clean webhook layer added on top
Every path validated in sandbox, then in production
What you get:
A native checkout fully inside your product, no third-party redirect
Tokenization and vaulting, so raw card data never sits in your database
Idempotency logic, so a retry never double-charges a customer
Reconciliation that matches every payment to an order

Your users pay inside a mobile app

Mobile in-app payments have their own rules: Apple Pay and Google Pay, native SDKs, and App Store policies that treat physical and digital goods differently. We handle the mobile payment gateway integration so checkout feels native on iOS and Android.
Show details
When this is relevant:
Your users buy or pay inside an iOS or Android app
You want Apple Pay and Google Pay as one-tap options
You sell physical goods, services or in-app digital items
You need the same payment logic across both platforms
Our approach:
SDK and payment methods picked to fit your product and stores
In-app flow built with tokenization and biometric auth
Setup aligned with App Store and Play payment rules
Real-device testing before release
What you get:
Apple Pay and Google Pay wired in as native, one-tap payment methods
A single payment flow shared across iOS and Android
App Store and Play rules handled for your product type
Card top-up or checkout that feels part of the app, not a web page

One gateway can't cover your routing, cost and uptime

When a single provider is a risk to your revenue, you run several. Multiple payment gateway integration with orchestration adds smart routing, fallback and retries, so a failed charge reroutes instead of being lost.
Show details
When this is relevant:
A single gateway outage means lost revenue for you
You want to route transactions by cost, country or card type
You operate across regions with different local providers
Your approval rates drop on certain banks or methods
Our approach:
Routing rules designed around cost, geography and approval rates
Orchestration layer built over your existing gateways
Fallback, retry and idempotency added to stop double charges
Approval rates monitored and routing tuned after launch
What you get:
Smart routing that sends each payment to the best gateway
Automatic fallback and retry when a provider declines or goes down
Multi-currency support across several payment processors
One reporting layer across all your gateways

Cost of payment gateway integration

Single-gateway integration

from $5,000
Timeline: 4 weeks
1 gateway, standard checkout | Standard scope
Hosted or redirect checkout
One payment processor
Webhooks mapped to your backend
Sandbox and production testing
PCI scope at SAQ-A
Examples: Stripe checkout for a SaaS product, PayPal for an online store, single rail for an MVP

Multi-gateway, web + mobile ⭐

$15,000–$40,000
Timeline: 8 weeks
2+ gateways, web and mobile
Direct api integration
Several payment gateways with routing and fallback
Mobile in-app payments with Apple Pay and Google Pay
Tokenization and reconciliation
Multi-currency support
Examples: marketplace with split payments, mobile app with card top-up, product accepting several local payment methods

Custom gateway and complex compliance

from $40,000
Timeline: 4 months
Custom build, heavy compliance | Advanced scope
Custom payment gateway development or PayFac logic
Provider migration with dual-running
Advanced fraud and risk rules
Full PCI-DSS scoping
Deep integration with your systems
Examples: payment product with sub-merchant payouts, regulated fintech platform, migration off a legacy provider
Note:
Exact cost depends on:
the integration method (hosted vs direct api)
the number of hosted payment gateways
mobile, web or both
your compliance and fraud requirements
Get the exact cost and timeline for your third-party payment gateway integration
Free payment integration scoping in 3 days: architecture, gateway choice and estimate. NDA signed before we discuss any details.
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Get the exact cost and timeline for your third-party payment gateway integration
Free payment integration scoping in 3 days: architecture, gateway choice and estimate. NDA signed before we discuss any details.
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Payment gateway integration process

We work in short stages with a demo after each one. From kickoff to live payments, you always know what is shipping and when.
1

Discovery and gateway selection

We map your product, your markets and your checkout, then recommend the gateways and integration method that fit.
Duration: 1 week
We review your current product and payment needs, compare providers on cost, coverage and approval rates, and choose between hosted, direct api or mobile SDK. We define the scope and lock the PCI approach before any code.
What you get:
A recommended gateway and integration method, matched to your product
A fixed scope with timeline and cost, so you can plan the budget
2

Architecture and PCI scoping

We design the various payment data flow and fix your PCI scope before development starts.
Duration: 1 week
We design how payment data moves through your system, decide what is tokenized and where card data is kept off your servers, and set the SAQ level. We plan webhooks, idempotency and reconciliation up front.
What you get:
A payment architecture with tokenization and a defined PCI scope
A technical plan for webhooks, retries and reconciliation
3

Integration and sandbox testing

We build the integration and test every payment path in the provider sandbox.
Duration: 2 weeks
We connect the gateway, build the checkout or in-app flow, and wire webhooks to your order and account logic. We test success, failure, refund and retry paths in sandbox until every case behaves.
What you get:
A working integration tested across success, failure and refund paths
Webhooks and idempotency verified, so no transaction is lost or doubled
4

Go-live and production validation

We move to production, run real test transactions and confirm everything settles.
Duration: 1 week
We switch to production keys, run controlled live transactions, and confirm money settles and reconciles correctly. We watch the first real payment information closely and fix anything that surfaces.
What you get:
Live payments validated with real transactions in production
Reconciliation confirmed, so payments match orders from day one
5

Monitoring and support

We keep watching transactions after launch and stay on for changes.
Duration: ongoing
We monitor transactions, approval rates and failures, handle reconciliation questions, and add gateways or methods as you grow. Support runs to an agreed SLA.
What you get:
Transaction monitoring and reconciliation after go-live
Support to an SLA, with new gateways or methods added as you scale

What our clients say about us

Pogovorim.online service screenshots
William Angel
Personalised — wellness app design

I'm the CTO of Personalised Co., an app for tracking supplement and vitamin intake. Purrweb designed the product's UI/UX with a Shopify store integration for automatic reordering, and built an interface for healthy living with personalized tracking.

Personalised — wellness app design
HealthTech, Design, Mobile app, Shopify, Wellness

Personalised Co. is an app for people who take supplements and vitamins regularly: intake tracking and automatic reordering through a Shopify integration. Purrweb designed the product's UI/UX with a supplement marketplace and a personal intake schedule.

View full case
Pogovorim.online service screenshots
Seth Abel-Sadeq
KEM — Payment app

I'm the CEO of KEM, a P2P mobile payment service for the Kuwaiti market, where not everyone has access to online banking. Our banking partners needed an MVP for demonstrations. Purrweb delivered the design and the MVP, working around the restrictions on connecting to the banking API. On completion, they handed the project over to our in-house team with full documentation and a month of technical support.

KEM — Payment app
Fintech, Design+Development, Mobile app, Cross-platform, MENA

KEM is a P2P app for instant money transfers in the Kuwaiti market: linked bank cards, money requests from the contact list, and transaction history. The key challenge: for security reasons, Kuwaiti banks don't allow outside developers to work with their API — so Purrweb built the back end on mock data, fully simulating the final functionality for demos.

View full case
Pogovorim.online service screenshots
Matt Brzowski
Founder
Buzz

I'm building Buzz, an app for finding and organizing events in small American towns. I came to Purrweb with almost nothing — just an idea. Purrweb helped with marketing, brand identity, and the logo, and walked the whole road to MVP with us, even when our requirements shifted a lot in the early stages. I valued the flexibility and the quality of the design.

Buzz
Lifestyle, Design+Development, Mobile app, Social app, Geolocation

Buzz is a geosocial service for residents of small American towns: a geolocation-based feed of public events, private events with friend invites, group chats, and a Ticketmaster integration. Purrweb created the brand identity from scratch, optimized the architecture, reused ready-made modules, and shipped the MVP in 12 months.

View full case
William Angel
Personalised — wellness app design

I'm the CTO of Personalised Co., an app for tracking supplement and vitamin intake. Purrweb designed the product's UI/UX with a Shopify store integration for automatic reordering, and built an interface for healthy living with personalized tracking.

Personalised — wellness app design
HealthTech, Design, Mobile app, Shopify, Wellness

Personalised Co. is an app for people who take supplements and vitamins regularly: intake tracking and automatic reordering through a Shopify integration. Purrweb designed the product's UI/UX with a supplement marketplace and a personal intake schedule.

View full case
Seth Abel-Sadeq
KEM — Payment app

I'm the CEO of KEM, a P2P mobile payment service for the Kuwaiti market, where not everyone has access to online banking. Our banking partners needed an MVP for demonstrations. Purrweb delivered the design and the MVP, working around the restrictions on connecting to the banking API. On completion, they handed the project over to our in-house team with full documentation and a month of technical support.

KEM — Payment app
Fintech, Design+Development, Mobile app, Cross-platform, MENA

KEM is a P2P app for instant money transfers in the Kuwaiti market: linked bank cards, money requests from the contact list, and transaction history. The key challenge: for security reasons, Kuwaiti banks don't allow outside developers to work with their API — so Purrweb built the back end on mock data, fully simulating the final functionality for demos.

View full case
Matt Brzowski
Founder
Buzz

I'm building Buzz, an app for finding and organizing events in small American towns. I came to Purrweb with almost nothing — just an idea. Purrweb helped with marketing, brand identity, and the logo, and walked the whole road to MVP with us, even when our requirements shifted a lot in the early stages. I valued the flexibility and the quality of the design.

Buzz
Lifestyle, Design+Development, Mobile app, Social app, Geolocation

Buzz is a geosocial service for residents of small American towns: a geolocation-based feed of public events, private events with friend invites, group chats, and a Ticketmaster integration. Purrweb created the brand identity from scratch, optimized the architecture, reused ready-made modules, and shipped the MVP in 12 months.

View full case
Do you want to order a development?
We will discuss your project in 30 minutes: we will assess the complexity, suggest solutions, and name approximate deadlines and budgets. We sign the NDA before the call. No strings attached.
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Let’s go!
Let’s go!
Do you want to order a development?
We will discuss your project in 30 minutes: we will assess the complexity, suggest solutions, and name approximate deadlines and budgets. We sign the NDA before the call. No strings attached.
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Budget
Please select one option in each category
Request sent
Our manager will contact you shortly.
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FAQ

What is payment gateway integration?

Payment gateway integration connects a payment provider, like Stripe or Adyen, to your existing app or platform so it can accept online payment options. It covers the checkout, the link to the provider, the handling of payment data, and the webhooks that update your orders and accounts when a transaction succeeds or fails.

What payment gateways do you integrate?

We integrate global providers such as Stripe, PayPal, Braintree, Adyen, Square, Authorize.Net and Checkout.com, wallets like Apple Pay and Google Pay, and local rails such as Mollie, Razorpay and Mercado Pago. If your provider has public API documentation, we can make it an integrated payment.

How much does payment gateway integration cost?

It depends on the method, the number of gateways and your compliance scope. A single-gateway integration starts at $5,000, a multi-gateway web and mobile setup runs $15,000 to $40,000, and custom or heavily regulated work starts at $40,000. For the full picture, see how to build a payment app.

How long does payment gateway integration take?

A single standard gateway goes live in about 4 weeks. A multi-gateway setup across web and mobile takes around 8 weeks. Custom gateway work or complex compliance runs about 4 months.

What are the types of integrated payment gateways?

There are three main types. Hosted or redirect keeps card data on the provider and your PCI scope light. Iframe embeds the provider's fields in your page. Direct API gives you a fully branded checkout with full control, but puts more of the PCI scope on you.

Is payment gateway integration PCI-DSS compliant?

Yes. We design every integration to reduce your PCI scope. Hosted fields and tokenization keep raw card data off your servers, which can move you to the lightest SAQ-A level. Where you need a direct API, we add tokenization, vaulting and encryption.

Can you integrate a payment gateway into a mobile app?

Yes. We handle mobile in-app payments on iOS and Android, including Apple Pay and Google Pay as one-tap methods. We build the flow with native SDKs, tokenization and biometric auth.

Can you integrate multiple payment gateways and support orchestration?

Yes. We run several payment gateways behind one layer with smart routing, automatic fallback and retries. Transactions route by cost, country or card type, and a failed charge reroutes instead of being lost.

Can you migrate us from one payment provider to another?

Yes. We move you off your current provider with no downtime. We run the old and new gateways in parallel, shift traffic gradually while watching approval rates, and migrate or re-vault card tokens so users are never asked to re-enter their cards.

Do you support multi-currency and cross-border payments?

Yes. We set up multi-currency processing and connect the local payment methods your markets expect, so customers pay in their own currency through familiar options.