Payments are one of those things nobody thinks about when everything works. You only notice them when something breaks. A card does not go through. A checkout freezes. A payout takes longer than expected. That is usually when businesses start digging deeper.

Behind most smooth payment experiences are companies that help connect payment systems with websites, apps, and internal tools. This work is rarely visible to users, but it matters a lot. In this article, we look at companies that handle payment gateway integration in real products. Not in theory. Not in marketing slides. Just how it works in practice.

 

1. OSKI Solutions

We work with businesses that need payment gateway API integration as part of real products, not experiments. Our team connects payment systems to web platforms, internal tools, and existing backends so transactions move correctly from start to finish. This usually includes handling checkout logic, syncing payments with order systems, and making sure data flows cleanly between services.

Our work often sits inside larger software projects. We integrate payment gateways into custom web applications, e-commerce platforms, and finance-related systems. The focus is on stability and clear logic. We spend time understanding how payments should behave in daily use, what can go wrong, and how to keep things predictable for both users and internal teams.

Key Highlights:

• Payment gateway integration inside custom software projects
• Experience with e-commerce and finance-related platforms
• Connection with ERP, CRM, and internal systems
• Clear and structured development process

Services:

• Payment gateway integration
• Custom API development
• Web application development
• Backend and frontend integration
• Cloud-based system integration

Contact Information:

• Website: oski.site
• Address: Kaupmehe tn 7-120, Tallinn, Estonia
• Phone: +48571282759
• E-mail: contact@oski.site 
• LinkedIn: www.linkedin.com/company/oski-solutions 

 

2. PLANEKS

PLANEKS works with payment setup and integration as a practical part of business systems. The team connects payment gateways to websites, web apps, and internal platforms where payments are only one part of a larger workflow. The focus stays on making transactions stable, predictable, and easy to manage inside the product.

PLANEKS usually handle payment gateway integration from start to finish. This includes planning how payments should work, connecting the gateway through APIs, testing real payment scenarios, and supporting the system after launch. The company integrates common payment providers and adapts them to existing software so payments do not feel like an added layer, but a natural part of the system.

Key Highlights:

• Payment setup and integration for web and software products
• Work with multiple payment providers and payment methods
• Integration testing and long-term support

Services:

• Custom API development
• Payment consulting and setup planning
• Integration testing and maintenance
• Ongoing technical support

Contact Information:

• Website: www.planeks.net
• Address: 124 City Road, London EC1V 2NX, United Kingdom
• Phone: +44 7384 852082
• E-mail: info@planeks.net
• LinkedIn: www.linkedin.com/company/planeks

 

3. Paytm

Paytm operates a payment infrastructure across a wide range of use cases. Payments are connected to websites, mobile apps, and offline systems through APIs that handle cards, bank transfers, and app-based payments.

The focus is on making payments work across different scenarios. Online checkouts. Service payments. Subscriptions. In-store transactions. Integrations usually connect payments with dashboards, settlements, and basic reporting so businesses can track activity without changing their core product.

Key Highlights:

• Payment infrastructure integration for online and offline payments
• Support for bank-based and app-based payment methods
• Tools for connecting payments with business systems
• Focus on stable transaction processing

Services:

• Payment infrastructure integration
• Online payment processing
• In-store payment acceptance

Contact Information:

• Website: paytm.com
• Address: One 97 Communications Ltd, One Skymark, Floor No. 6th to 22nd, Tower-D, Plot No. H-10B, Sector-98, Noida-201304
• Phone: +91-120- 4770770
• E-mail: cybercell@paytmbank.com
• LinkedIn: www.linkedin.com/company/paytm
• Twitter: x.com/paytm
• Facebook: www.facebook.com/Paytm
• Instagram: www.instagram.com/paytm

 

4. Stripe

Stripe is usually brought in when a business wants payments to just work without being in the way. It connects payments to websites, apps, and internal tools, whether people pay online or in person. Most teams use it to handle things like checkout, subscriptions, and payouts, so they do not have to build all of that themselves.

What stands out is how flexible the setup is. Stripe lets businesses accept different payment methods and tie payments to users or orders in a way that makes sense for the product. Money movement, billing, and reporting often live in the same place. That makes it easier to keep track of things as the business grows or changes.

Key Highlights:

• Payment setup for web and mobile products
• Works with both online and in-person payments
• Fits custom checkout and billing flows
• Connects payments with internal systems

Services:

• Payment system setup
• Online payment handling
• Subscription and billing setup
• Platform and marketplace payments
• Payment reporting tools

Contact Information:

• Website: stripe.com

 

5. PayPal

PayPal is often used when a business just wants payments to work without overthinking it. It plugs into websites, apps, and online services and ties payments into checkout, orders, and user accounts. Everything runs through the same setup, whether people pay by card, wallet, or bank transfer.

What makes PayPal easy to live with is how familiar it feels. Businesses can add different payment options without changing how their product already works. Things like refunds, repeat payments, and basic tracking are usually right there, so payments stay part of the everyday flow instead of becoming their own headache.

Key Highlights:

• Payment gateway API integration for online payments
• APIs designed for web and mobile checkout flows
• Tools for managing payments and refunds

Services:

• Payment gateway API integration
• Online payment processing
• Wallet and card payment support
• Subscription and recurring payment setup
• Transaction and refund handling

Contact Information:

• Website: www.paypal.com
• Address: 2211 N 1st St, San Jose, CA 95131, United States
• LinkedIn: www.linkedin.com/company/paypal
• Twitter: x.com/PayPal
• Facebook: www.facebook.com/PayPal
• Instagram: www.instagram.com/paypal

 

6. Addon Solutions

Addon Solutions usually come into the picture when payments need to fit neatly into an existing project. They connect payment systems to websites, online stores, and custom apps so everything works together as expected. Things like checkout, orders, and backend updates are handled in a way that feels consistent with how the product already runs.

They treat payment integration as a practical job, not a feature that lives on its own. Instead of reshaping the product around the payment system, the setup is adjusted to match how the platform already works. This makes payments more stable in day-to-day use and easier to follow when it comes to tracking transactions and handling issues.

Key Highlights:

• Payment setup for websites and online stores
• Work with both custom-built systems and existing platforms
• Payments connected cleanly with backend logic
• Integration handled as part of full development work

Services:

• Payment system setup and integration
• Custom software development
• E-commerce platform integration
• Backend and frontend development
• Ongoing technical support

Contact Information:

• Website: www.addonsolutions.com
• Address: 92/Sarovar Complex, Bh Samudra Annexi, Navrangpura, Off C.G. Road, Ahmedabad, Gujarat, INDIA
• Phone: +91 9925039225
• E-mail: info@addonsolutions.com
• LinkedIn: www.linkedin.com/company/addonsolutions
• Twitter: x.com/addonsolutions
• Facebook: www.facebook.com/addonsolutions
• Instagram: www.instagram.com/addonsolutions

 

7. CCAvenue

CCAvenue provides integration payment APIs into a product for businesses that need to accept payments across websites, apps, and offline channels. The platform connects online checkouts, mobile payments, and in-store transactions through a single system. Integration usually happens via APIs, SDKs, or ready plugins that link payments with order flows and backend systems.

CCAvenue focuses on covering many payment scenarios in one setup. Payment gateway APIs support online stores, subscription payments, invoice-based payments, and mobile app transactions. Integration is often used by businesses that want payments to stay consistent across different channels, while keeping reporting and settlement in one place.

Key Highlights:

• Integrating payment APIs into a product for web, mobile, and offline use
• Support for multi-channel payment flows
• APIs and SDKs for custom system integration
• Tools for tracking payments and settlements

Services:

• Integrating payment APIs into a product
• Online payment processing
• In-store and contactless payment solutions

Contact Information:

• Website: www.ccavenue.com
• Address: Level II, Plaza Asiad, S. V. Road, Santa Cruz (West), Mumbai - 400054. Maharashtra, India
• Phone: +91 8801033323
• E-mail: contact@ccavenue.com

 

8. Razorpay

Razorpay is usually picked when a business wants payments to feel like part of everyday work, not a separate tool on the side. It connects payments to websites, mobile apps, and backend systems so everything moves through one flow. Checkout, payouts, subscriptions, and other payment steps are handled inside the product instead of being bolted on later.

What makes the setup useful is how flexible it is. Razorpay lets businesses accept payments, send payouts, and link payment data with tools like accounting or payroll. 

Key Highlights:

• Payment setup for web and mobile platforms
• Works with online, in-store, and cross-border payments
• Custom checkout and payout flows
• Connection with business and finance tools

Services:

• Payment system setup and integration
• Online and in-app payment handling
• Payout and settlement setup
• Subscription and recurring payments

Contact Information:

• Website: razorpay.com
• Address: 1st Floor, SJR Cyber, 22 Laskar Hosur Road, Adugodi, Bengaluru, Karnataka, India
• LinkedIn: www.linkedin.com/company/razorpay
• Twitter: x.com/razorpay
• Facebook: www.facebook.com/Razorpay
• Instagram: www.instagram.com/razorpay

 

9. Jagaad

When Jagaad works on a digital product, payments are treated as part of the overall experience, not a separate feature bolted on later. Payment systems are connected through backend services so checkout, orders, and user actions all move together across the platform. Payment setup usually happens alongside other platform work. Jagaad connect payment providers to e-commerce systems, custom apps, and internal tools while the product is being built or extended. The main goal is simple. Keep integrations clean. Make data flow predictably. Ensure payments behave the way the product expects them to in real use.

Key Highlights:

• Payment integration for web and mobile products
• API connections with external and internal services
• Experience with e-commerce and custom-built platforms

Services:

• Payment system setup and integration
• Custom API development
• Web and mobile application development

Contact Information:

• Website: jagaad.com
• LinkedIn: www.linkedin.com/company/jagaad
• Facebook: www.facebook.com/JagaadDigitalCompany
• Instagram: www.instagram.com/jagaadgram

 

10. Instamojo

Instamojo is often used by people who sell products or services online and want payments to feel simple. It connects payments directly to websites, landing pages, and online stores, so sellers can take money without juggling extra tools. Everything runs through the checkout, which keeps the process straightforward.

The setup is designed for smaller teams and growing businesses. Instamojo supports cards, bank transfers, and local payment options, all tied to stores or payment links. Payments usually sit next to basic store tools, payouts, and simple tracking, so handling money becomes part of the daily routine instead of something separate to manage.

Key Highlights:

• Payment setup for online stores and website
• Support for different online payment methods
• Payments linked directly to checkout and orders

Services:

• Payment system setup and integration
• Online payment processing
• Payment links and embedded buttons
• Payout and settlement handling
• Basic store and payment management tools

Contact Information:

• Website: www.instamojo.com
• Address: 3rd Floor, Maa Grace, 12, 7th Cross Road, Koramangala 1A Block, Bangalore – 560034
• E-mail: support@instamojo.com
• LinkedIn: www.linkedin.com/company/instamojo
• Twitter: x.com/instamojo
• Facebook: www.facebook.com/Instamojo
• Instagram: www.instagram.com/instamojo_india

 

11. 2Checkout

2Checkout is usually used by businesses that sell digital products or run subscription services. It connects payments to websites, apps, and online stores that sell across different countries. Payments go through a single setup that handles checkout, repeat billing, and transactions in different regions.

The payment setup is built around how sales actually happen. One time purchases, subscriptions, and renewals all run through the same system. Payments are also tied into things like taxes, compliance checks, and basic revenue tracking. That way, payments stay part of the overall sales flow instead of becoming a separate process to manage.

Key Highlights:

• Payment setup for digital products and online services
• Support for global payment flows
• Tools for subscriptions and recurring charges
• Integrations that fit existing sales systems

Services:

• Payment system setup and integration
• Online payment processing
• Subscription and recurring payment handling
• Digital product payment support

Contact Information:

• Website: www.2checkout.com
• Address: 11700 Great Oaks Way # 210, Alpharetta, GA 30022, Georgia, USA
• LinkedIn: www.linkedin.com/company/2checkout
• Facebook: www.facebook.com/2Checkout.2CO
• Instagram: www.instagram.com/2checkoutinc

 

12. Azati

Azati usually works on custom software where different systems need to work together smoothly. Payments are added as part of backend and web app development, not as an extra layer on top. Everything is connected through APIs so transactions follow the same logic as the rest of the product.

Payment setups are often built alongside other tools like accounting systems, internal platforms, or third party services. The goal is to keep things steady and predictable. Payments go through securely, callbacks behave as expected, and services talk to each other without breaking the flow. This kind of setup is common in finance related products, SaaS tools, and larger business systems where payments need to work properly every single day.

Key Highlights:

• Payment gateway integration within custom software projects
• Experience with API based system connections
• Work with web platforms and backend services
• Focus on stable data flow and secure transactions

Services:

• Payment gateway integration
• API development and service integration
• Custom web application development
• Backend and cloud solutions
• Ongoing technical support

Contact Information:

• Website: azati.ai
• Address: Hozha 86/410, Warsaw, 00-682, Poland
• E-mail: info@azati.com
• LinkedIn: www.linkedin.com/company/azati-corporation
• Facebook: www.facebook.com/azati.world

 

13. Webuters

Webuters usually work on projects where payments are just one part of a bigger system. They connect payment systems to websites, mobile apps, and digital commerce platforms so everything runs together without friction. Payments are wired in through APIs, which helps checkout, billing, and orders work smoothly with the software that is already in place.

A lot of the work happens alongside CRM, ERP, and cloud systems. The idea is simple. Payments should follow the product’s logic, not force changes to it. Integrations are handled as part of the wider platform build, making sure data moves cleanly between payment providers, internal tools, and reporting systems.

Key Highlights:

• Payment setup for web and mobile platforms
• Experience connecting payments with CRM and ERP systems
• Work on custom software and digital commerce projects

Services:

• Payment system setup and integration
• System and API integration
• Custom web application development
• E-commerce platform development
• Cloud and backend services

Contact Information:

• Website: www.webuters.com
• Address: Platina Heights, C-24, CO-DESQ, Unit - 27, Sector 62, Noida, Uttar Pradesh 201301
• E-mail: info@webuters.com
• LinkedIn: www.linkedin.com/company/webuters-technologies
• Twitter: x.com/webuters
• Facebook: www.facebook.com/webuters
• Instagram: www.instagram.com/webuters

 

14. Metizsoft

Metizsoft usually works on software and online store projects where payments are just part of how the product runs every day. Payments are added alongside things like store logic, user accounts, and internal systems. Nothing gets rebuilt just to make payments work. The setup is shaped to fit the platform that is already there. This kind of approach works well for retail, finance-related tools, and service platforms where payments need to stay stable and easy to manage. They connect payment systems to websites, online shops, and mobile apps so checkout, orders, and backend tools all stay in step.

Key Highlights:

• Payment gateway API integration for web and e-commerce platforms
• Experience with custom store and application setups
• Integration of payments with backend and order systems
• Focus on clean and predictable payment flows

Services:

• Payment gateway API integration
• Custom software development
• E-commerce platform development
• API and system integration
• Ongoing technical support

Contact Information:

• Website: www.metizsoft.com
• Address: A-802, Ganesh Plaza, Navrangpura, Ahmedabad, India
• Phone: +9198989 64818
• E-mail: hello@metizsoft.com
• LinkedIn: www.linkedin.com/company/metizsoft-solution
• Twitter: x.com/MetizSoft
• Facebook: www.facebook.com/metizsoft
• Instagram: www.instagram.com/metizsoft

 

15. Crest Infotech

Payments usually come into Crest Infotech projects after the main product logic is already taking shape. The team connects payment systems in a way that supports how the website or app is meant to work, not the other way around. Checkout, orders, and backend processes are wired together so nothing feels out of place.

A lot of the work happens alongside custom web and mobile development. Payment providers are linked to user accounts, order data, and internal tools as part of the same build. The goal is to keep transactions moving smoothly, without adding extra steps or creating separate payment logic that teams have to manage later.

Key Highlights:

• Payment setup integrated into existing product logic
• Work with custom-built websites and e-commerce platforms
• Clear connection between payments and backend systems
• Focus on steady, predictable payment behavior

Services:

• Payment system setup and integration
• Web application development
• Mobile application development
• API and system integration
• Ongoing project support

Contact Information:

• Website: www.crestinfotech.com
• Address: B-15, Galaxy Signature, Science City Road, Sola, Ahmedabad - 380060, India
• Phone: +91 9327246412
• E-mail: rakshit@crestinfotech.com
• LinkedIn: www.linkedin.com/company/crest-infotech
• Twitter: x.com/raxit4u2
• Facebook: www.facebook.com/crestwebtech
• Instagram: www.instagram.com/crest.infotech

Conclusion

Payment gateway API integration is rarely the most visible part of a product, but it is one of the most important. When it works well, nobody notices it. Payments go through, data stays in sync, and teams do not have to think about it every day. When it does not, everything slows down fast.

The companies covered in this article approach payment integration in different ways, but the good ones share a similar mindset. Payments should fit the product, not reshape it. Integration should support existing workflows, not complicate them. And the setup should be stable enough to handle real use, not just ideal scenarios.

Choosing a payment gateway integration partner is less about features on a page and more about how well the team understands your system. The right choice usually comes down to clarity, experience, and how naturally payments can become part of your product’s daily flow.