How much does it cost to integrate a payment gateway into a mobile app?

The build cost depends on how many payment flows you need (one-off, subscriptions, saved cards, refunds, payouts), how many gateways and regions, and whether you use the gateway's hosted components or build your own screens. A single gateway with a hosted checkout and one-off payments is the smallest version. Subscriptions, marketplace payouts or several regions each add a block of work. Then add the ongoing per-transaction fees, which usually dwarf the build cost over time.

Is Stripe or Razorpay cheaper to integrate?

The integration effort is similar: both have well-documented SDKs for iOS, Android, Flutter and React Native, test modes and hosted components. The difference is in fees, supported countries and local payment methods. Stripe suits apps selling into the UK, Europe and the US. Razorpay suits apps selling in India with UPI, net banking and local wallets. Many apps selling in both regions integrate both, which roughly doubles the integration and testing work.

Do in-app purchases through Apple and Google count as a payment gateway?

They are a separate channel with their own rules. Apple and Google require digital goods and subscriptions consumed inside the app to go through their billing systems, which take a commission and have their own integration work. Physical goods and services consumed outside the app can use a payment gateway such as Stripe or Razorpay. Many apps need both, and a quote should state which flows go through which channel.

What is PCI compliance and does my app need it?

PCI DSS is the card industry's security standard for anyone that handles card data. If your app uses the gateway's own SDK or hosted components so card numbers never reach your servers, your obligations are small and mostly a self-assessment questionnaire. If you build your own card entry screens and send card data through your backend, your scope grows considerably and so does the cost. Keep card data on the gateway's side unless you have a very specific reason not to.

Payment Gateway Integration Cost for Mobile Apps

The payment gateway integration cost mobile app owners budget for has two halves, and most quotes only show one. The first half is the build: connecting the gateway, handling the flows you need (one-off payments, subscriptions, refunds, saved cards, payouts), testing every failure path and getting through app store review. The second half is the ongoing cost: per-transaction fees, chargebacks, currency conversion and whatever compliance work your design brings into scope. Over the life of the app, the second half is usually larger than the first.

This post separates the two so you can read the payment gateway integration cost mobile app developers quote properly. It covers what you pay for in the build, how Stripe, Razorpay and PayPal compare as integrations, the fees nobody quotes, what PCI scope adds, and a checklist for comparing two payment integration quotes.

What the payment gateway integration cost mobile app teams quote pays for

"Add payments" is never one feature. The cost to add payments to an app is the sum of the flows you need, and each flow is a separate piece of work with its own screens, backend logic, error handling and tests.

Flow	What it involves	Effect on payment gateway integration cost
One-off payment	Checkout screen, payment intent, confirmation, receipt	The baseline; smallest version of the integration
Saved cards and wallets	Tokenised cards, Apple Pay, Google Pay, UPI or local wallets	Moderate; the gateway does most of the heavy lifting
Subscriptions	Plans, trials, upgrades, failed renewals, dunning emails, cancellations	Significant; the renewal and failure logic is where the work is
Refunds and partial refunds	Staff tooling, reconciliation, customer notification	Moderate; often forgotten and then urgent
Marketplace payouts	Onboarding sellers, splitting payments, holding funds, paying out	Large; brings regulatory questions with it
Multi-currency and multi-region	Currency display, local methods, tax rules, settlement	Large; often means a second gateway
Webhooks and reconciliation	Backend endpoints for payment events, matching to orders, retries	Essential in every build; invisible in demos
Store billing	Apple and Google in-app purchase for digital goods	A separate integration with its own review rules

Beyond the flows, three things add to the payment gateway integration cost mobile app projects carry in every build:

Backend work. Payment logic lives on the server, not in the app. Creating payment intents, verifying webhooks, updating orders, retrying failures and keeping an audit trail are backend features that a mobile-only quote may not include.
Testing the failure paths. Declined cards, expired cards, three-D secure challenges, network drops mid-payment, double taps, app killed after payment but before confirmation. A payments integration that only handles the happy path will cost you in support tickets and lost orders.
Store review. Apple and Google examine how apps take money. Using a gateway for digital goods that should go through in-app purchase is a common rejection, and fixing it late is expensive.

Our mobile app development work treats payments as a backend feature with a mobile front end, which is why the quote lists the server work explicitly.

Stripe, Razorpay and PayPal integration cost compared

The integration effort for the three is closer than their marketing suggests. All three provide mobile SDKs, hosted or drop-in payment components, test modes and webhook events. The differences that affect cost are coverage, local methods and fee structure.

Stripe integration cost for an app. Strong SDKs for iOS, Android, Flutter and React Native, prebuilt payment sheets that keep card data off your servers, and good subscription tooling. Best suited to apps selling into the UK, Europe, the US and other markets Stripe serves. Its published UK rate for standard UK cards is 1.5% plus 20p per transaction at the time of writing, with higher rates for EU and international cards; check the pricing page for your country.

Razorpay integration cost for an app. The usual choice for apps taking payments in India, with UPI, net banking, cards and wallets in one integration and mobile SDKs for the main frameworks. Its standard plan is published as a 2% platform fee plus GST per transaction on domestic payments, with international and some payment methods priced differently; again, check the current page.

PayPal integration cost for an app. Useful where customers expect to see the PayPal button, and as a secondary method beside a card gateway. Its mobile SDKs and checkout are mature; the fee structure varies by country and transaction type, so look up your own.

The payment gateway integration cost mobile app builds carry is similar across the three for a single gateway with one-off payments. Cost rises when you need two gateways (for example Stripe for the UK and Razorpay for India), because every flow, every webhook and every test has to be done twice and reconciled into one order system. If your app sells in both regions from day one, budget for that; if one region can wait, launch with one gateway.

The ongoing fees nobody quotes

The build part of the payment gateway integration cost mobile app owners pay is paid once. These are paid for the life of the app, and a quote that does not mention them is leaving out the bigger number.

Per-transaction fees. A percentage plus a fixed amount per successful payment, set by the gateway and varying by card type, region and payment method. At meaningful volume this is your largest payment cost by far. Model it on your expected monthly revenue and average order value, because a small fixed fee matters a great deal when orders are small.
International and currency fees. Cards issued abroad and payments in another currency carry higher rates and a conversion margin. If a quarter of your customers are overseas, your effective rate is higher than the headline.
Chargebacks. When a customer disputes a payment, the gateway charges a fee and may hold the funds. You also pay in staff time to respond with evidence. Good receipts, clear descriptors and a sensible refund policy reduce them, and the integration should make evidence easy to collect.
Failed-payment handling. Subscription renewals fail for ordinary reasons (expired cards, insufficient funds). Recovering them needs retry logic and emails, which the gateway may provide for a fee or which you build.
Payout timing and reserves. Funds settle on the gateway's schedule, and some accounts carry a rolling reserve. Not a fee, but a cash-flow cost worth knowing.
Store commissions. Digital goods sold through Apple and Google billing carry their commission, which is separate from and usually larger than gateway fees.
Gateway add-ons. Fraud tools, tax calculation, subscription billing dashboards and invoicing are often priced on top of the base rate.

Put these in a spreadsheet with your expected volume before you compare gateways. The right gateway for a business with small, frequent orders is not necessarily the right one for large, infrequent ones.

PCI scope and what it adds

PCI DSS is the card industry's security standard, and your obligations depend on how card data moves through your system. This is a design decision that changes the payment gateway integration cost mobile app projects face more than almost any other.

Gateway-hosted components (recommended). The gateway's SDK renders the card entry fields and sends card data straight to the gateway. Your app and servers never see a card number. Your obligations are the lightest category of self-assessment, and the integration is simpler and faster.
Your own card screens, gateway tokenisation. You design the fields but the gateway's library tokenises the data in the app. Scope grows a little; design freedom grows a little.
Card data through your backend. Your servers receive raw card numbers. This brings you into a much heavier compliance category: network controls, logging, scanning, assessments and ongoing audits. It is rarely justified for an app, and any quote proposing it should explain why.

The practical rule: keep card data on the gateway's side. It keeps the build cheaper, the ongoing compliance cost small, and the risk of a breach off your books. The fintech projects where heavier scope is justified are the ones that are themselves payment businesses, not apps that take payments.

How to read a payment integration quote

When a quote for payments lands, check it against this list before comparing totals.

Flows named. One-off, saved cards, wallets, subscriptions, refunds, payouts. If a flow you need is missing, the quote is for a different project.
Backend included. Payment intents, webhooks, reconciliation, admin tooling for refunds. A mobile-only line is half the work.
Gateways and regions. One or two, and which local methods.
Store billing. Whether any of your products must go through Apple or Google billing, and whether that integration is included.
Failure paths and testing. Declines, three-D secure, network drops, duplicate taps, and testing against the gateway's test mode.
PCI approach. Hosted components or something heavier, and why.
Ongoing fees modelled. A simple projection of transaction fees at your volume, with the gateway's published rates linked.
Who holds the accounts. You should own the gateway account, its keys and its data. You own the code and IP; you should own the merchant account too.

If two quotes differ widely, the gap is usually a missing flow, a missing backend, or one quote assuming hosted components while the other builds custom card screens. Payments are also where the integration effort hides behind a small-looking feature; why small software changes take so long explains the general pattern.

Budgeting for payments in your app

Treat the payment gateway integration cost mobile app owners face as two budgets: a build budget sized by the flows, gateways and regions you need, and a running budget sized by your transaction volume, mix of cards and expected chargebacks. Keep card data on the gateway's side, launch with one gateway if you can, and insist that the quote lists the backend work and the failure-path testing.

If you want a number for your own app, book a free 30-minute discovery call. A senior engineer will go through the flows with you, and we send a written approach, timeline and estimate within two business days.

Payment gateway integration cost for a mobile app: the full bill