People spend more time on apps than on websites and they expect to be able to pay within them too. If you are building a mobile product that involves any kind of transaction, integrating a payment gateway for mobile apps is not optional; it is essential. It is what allows your users to pay for products, services, or subscriptions without ever leaving your app. Done right, it feels seamless. Done wrong, it costs you customers. This guide walks you through what to consider, how to choose the right provider, and exactly how to complete the mobile app payment gateway integration step by step.
Table of Contents
Choosing the Best Payment Gateway for Your Mobile App
Before any code is written, you need to pick the right provider. Here is what matters most when evaluating a payment gateway for app integration:
• SDK availability: The best payment gateway for mobile app use will offer official SDKs for both Android and Ios, ideally with clear documentation, code samples, and active developer support. This makes Android payment gateway integration and iOS payment gateway integration far smoother.
• Payment methods supported: In India, your mobile payment platform must cover UPI, credit and debit cards, wallets, net banking, and EMI. Offering fewer options directly reduces your conversion rate.
• Security and compliance: Look for PCI-DSS compliance, tokenisation, 3D Secure (3DS) authentication, and built-in fraud detection as standard. You are handling sensitive financial data, there is no room for shortcuts here.
• Transaction fees and settlement: Compare fees honestly, including payout timelines. Even small fee differences compound significantly at scale.
• Sandbox environment: A solid sandbox for testing is non-negotiable. You need to simulate real transactions before going live without risking actual money.
PayU is one of the best payment gateway options for mobile apps in India. It offers dedicated Android and iOS SDKs, supports all major Indian payment methods, and provides a well-documented payment API that developers find straightforward to work with. Whether you are building a shopping app, a service platform, or a fintech product, PayU’s mobile payment platform handles the complexity so you do not have to.
Hosted vs. Non-Hosted Payment Gateway
Before you integrate, it helps to understand the two main approaches. The table below breaks down the key differences:
| Factor | Hosted Gateway | Non-Hosted (Embedded) Gateway |
| How it works | Redirects users to the gateway’s secure payment page, then back to your app | Processes the entire payment within your app using the payment gateway API |
| User experience | Less native, user leaves the app to pay | Fully native, user never leaves your interface |
| Setup effort | Quick minimal custom development required | More involved, requires SDK or direct API integration |
| Conversion rate | Lower, redirect friction increases drop-offs | Higher, seamless flow keeps users in the moment |
| Best for | MVPs, quick launches, or low transaction volume apps | Serious mobile products where UX and conversions matter |
For most serious mobile products, the non-hosted approach is the preferred route. The additional development effort pays off quickly in better conversions and a more professional user experience.
How to Add a Payment Gateway to a Mobile App?
Step 1: Create and Verify Your Merchant Account
Sign up with your chosen provider, PayU, for example and complete the merchant onboarding process. Submit your KYC documents, get your account verified, and collect your API credentials: typically a Merchant Key and a Salt or Secret. These are what your app uses to communicate securely with the gateway.
Step 2: Choose Your Integration Method
Decide whether you will use the provider’s SDK (recommended for most teams) or a direct payment gateway API integration. SDK-based integration uses pre-built UI components and payment handling methods, which significantly reduces the development time for both Android payment gateway integration and iOS payment gateway integration.
Step 3: Install the SDK
For Android: Add the gateway’s dependency to your build. Gradle file and sync your project. For iOS: Use CocoaPods or Swift Package Manager to add the SDK to your Xcode project. Both PayU’s Android and iOS SDKs come with sample projects that show you exactly how the implementation should look before you write a single custom line.
Step 4: Initialise the Payment Gateway
In your app’s code, initialise the gateway using your Merchant Key and environment setting (test or live). This is where your app establishes a trusted connection with the payment provider. The SDK handles token generation, session management, and secure data transmission automatically once this step is complete.
Step 5: Build the Payment Flow
Design the payment screen your users will interact with. This includes collecting payment details (or letting the SDK’s pre-built UI handle it), selecting the payment method, UPI, card, wallet, EMI and triggering the transaction. Keep the experience clean and minimal. Every extra step at checkout increases the chance of drop-off.
Step 6: Handle Payment Responses
Your app should be capable enough to handle three possible outcomes, namely success, failure and pending. If it shows ‘success, ‘ then the order status has to be updated accordingly and display a confirmation screen. When it shows ‘failure’, display a clear, helpful error message and facilitate the user with an easier way to retry. On pending, inform the user and set up a webhook or polling mechanism to capture the final status once it resolves.
Step 7: Test Thoroughly in Sandbox Mode
Use your gateway’s sandbox environment to simulate successful payments, declines, network timeouts, and edge cases. Test on multiple devices, both Android and iOS, and across different payment methods.
Step 8: Go Live and Monitor
Switch your environment setting from test to live, submit your app update, and keep a close watch on your first batch of real transactions. Keep an eye on success rates, settlement reports, and any error patterns through your gateway’s dashboard. PayU’s merchant dashboard gives you this visibility in real time, making it easy to track and find a resolution at an early age.
Conclusion
Adding a payment gateway for mobile apps is one of the highest-impact investments you can make in your product. It directly affects how many users complete a purchase, how much they trust your app, and how smoothly your revenue flows. Choose a provider like PayU that offers strong Android and iOS support, covers all the payment methods your users expect, and makes the mobile app payment integration process as straightforward as possible. Set it up carefully, test it thoroughly, and it will quietly power every transaction in your app, letting you focus on everything else that makes your product great.
FAQs
1. What is the best payment gateway for mobile apps in India?
PayU is among the top choices for Indian mobile apps. It offers Android and iOS SDKs, supports UPI, cards, wallets, net banking and EMI, and has a developer-friendly payment API with solid documentation.
2. Is the integration process different for Android and iOS?
The overall steps are the same, but the tools differ. Android payment gateway integration uses Gradle and Java or Kotlin, while iOS payment gateway integration uses CocoaPods or Swift Package Manager with Objective-C or Swift. Most providers, including PayU, offer separate SDKs and documentation for each platform.
3. Do I need a developer to integrate a payment gateway in a mobile app?
Yes, in most cases. Mobile app payment gateway integration involves code-level changes to your app. SDK-based integrations are more accessible, but you will still need a developer familiar with Android or iOS development to implement and test correctly.
4. What is tokenisation and why does it matter?
Tokenisation replaces sensitive card data with a unique token before it is transmitted or stored. This means your app never handles raw card numbers directly, which reduces your security risk and simplifies PCI-DSS compliance.
5. Can I offer both UPI and card payments through one mobile payment gateway integration?
Yes. A good payment gateway for mobile apps like PayU lets you enable multiple payment methods, UPI, cards, wallets, net banking, EMI all through one SDK integration. No separate setup is needed for each method.
6. How long does mobile app payment integration take?
A standard SDK-based integration typically takes 40 to 60 hours of development time, plus 20 or more hours for testing. Custom flows or advanced configurations may take longer. Ongoing maintenance typically requires around 5 to 10 hours per month.
7. What is a payment gateway API and do I need it for mobile apps?
A payment API is the interface through which your app communicates with the gateway’s servers. For most mobile integrations, the SDK abstracts the raw API calls for you. However, for custom flows or server-side operations like refunds and webhooks, direct payment gateway API calls from your backend are typically required.
8. What should I do if a payment gets stuck in a pending state?
Set up webhooks with your payment provider so your server receives real-time status updates automatically. Most gateways, including PayU, send webhook notifications when a pending transaction resolves either to success or failure so you can update your order records without manual intervention.