Marketplace Integration for eCommerce Software Developers

Today marketplace integration is no longer optional but it has become a necessity both for online store owners and eCommerce software providers. Integration with popular marketplaces such as Amazon, eBay, Etsy, and Walmart allow eCommerce SaaS to to remain competitive and provide comprehensive solution to its clients.

This article covers all aspects of developing marketplace integration and how to implement it easily using a unified API.

What is Marketplace Integration?

Marketplace integration (in the context of eCommerce software) means the process of developing a connection between eCommerce software and any online marketplace. It enables them to get access to the data from e-stores listed on those marketplaces. Without this kind of connection, the services like, for example, shipping management, order and inventory management, marketing automation, WMS, ERP, repricing software, etc., can not work with retailers’ stores and perform their vital functions.

In other words, with the help of high-quality integration with various marketplaces, it is possible to retrieve, add, delete and sync the data on products, orders, customers, shipments that are placed in e-stores of those retailers that use these sales channels for promoting their goods.

The smooth connection with multiple marketplaces is beneficial and vital for B2B eCommerce solutions and enterprises of different kinds. To help e-store owners organize and automate their e-retail business, various software solutions need to access their customers' store databases. We are talking about inventory and order management, mobile app building, marketing automation, repricing, shipping management, and other similar software. And this is impossible without developing a smooth marketplace integration that ensures real-time synchronization.

However, developing integration is not so easy. It requires a lot of investigations, considerable budgets, further maintenance, and qualified staff.

How Does the Process of Marketplace Integration Development Work?

Tying your software with various shopping platforms involves performing a certain number of tasks. The integration is certainly not an easy procedure, but a complex one that requires specific skills and a lot of time and financial investment.

To be more specific, there are four main stages in the process of marketplace integration:

• Stage #1: This first stage involves exploring the peculiarities and specifics of each marketplace. At this point, you need to understand that each marketplace has its unique API and bespoke documentation. As a result, integrating your software with each of them is a unique process that requires specific skills. To ensure that you’ll do a fine job, you need to look at the specifics of each marketplace and explore its API documentation.
• Stage #2: This is when you’re ready to develop an integration between your software and the marketplace. You have two options here: either hire a team of developers or use your in-house developers to manually set up a connection, or utilize a third-party integration service that does the job in your place and connects your system with multiple marketplaces at once.
• Stage #3: The third stage involves transferring data between the marketplace and your software. This data includes order info, product info, shipping details, taxes, prices, and the list goes on.
• Stage #4: The last stage involves ongoing support and maintenance of the integration.

Marketplace Software Integration Development

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What are the Main Benefits of Connecting with Marketplaces?

So why should you connect with marketplaces in 2025 and beyond? Below are five main reasons to invest today in a secure integration with the most popular marketplaces out there:

1. Access all the required data related to your clients’ orders, products, categories, inventory, customers, taxes, or shipping statuses. All of this data is extremely important for you, especially if you depend on it to run your business and provide your services.
2. Benefit from real-time updates of orders, inventory, or product details: one of the perks of eCommerce integration is that you’ll always be on top of any change in your clients’ inventory information. In addition, once you integrate your software with any of the marketplaces, you’ll benefit from real-time communication with the connected system. This allows you to offer precise services to your clients and never mix up orders.
3. Be able to work with all the sellers who use the marketplaces: the more marketplaces you integrate your software with, the more customers you’ll gain access to, and the larger your business will grow.
4. Gain the ability to expand your market share. Once you’re offering more stable services and you can reach a wider audience, you’ll consequently be able to expand into new markets and boost your presence in your niche.
5. Enjoy a significant increase in your profits: that’s the ultimate benefit you will get to enjoy.

The Main Difficulties of Marketplace Integrations Development

The development of the integration with marketplaces requires a lot of developers' efforts and time. Moreover, it costs thousands of dollars to companies that need it.

The main issues that you need to take into consideration if you are going to develop the integration on your own are:

• Need for Highly Skilled Specialists. The integration demands skilled and experienced tech specialists and advanced knowledge of development. It is hard to find a qualified dev team in the short term.
• Marketplace-specific APIs. Each online marketplace has its own API with unique architecture and specifics. For instance, the API of the eBay marketplace is not uniform. It means that various types of resources, like, for example, orders and products, have different data formats.
• Lengthy development process. The development of integration with only one marketplace can take more than a few months of your developers' time. Moreover, it requires previous investigations of the marketplace specifics.
• Ongoing maintenance. Integration development is only the first step. As marketplaces can make different changes connected with their APIs, you will have to take care of the further connection maintenance and upgrading. This task also needs the work of qualified developers.

The easiest and cheapest way to integrate your software with eBay, Etsy, Amazon, and Walmart is to use API2Cart - a unified shopping platform API integration interface.

With API2Cart, you can save your money, time and efforts. Also, you won’t need to hire a great team of professional developers for building integration with various shopping platforms and marketplaces.

The Easiest and Most Cost-Effective Solution for Marketplace Integration: API2Cart

API2Cart provides a unified API that simplifies the process of connecting your eCommerce software to multiple online marketplaces such as Amazon, eBay, Etsy, and Walmart. It has already investigated complex marketplace APIs and developed an integration with them. So, you just need to connect to API2Cart and use its unified API and 100+ API methods to get, add, update and sync various store data placed on marketplaces.

Using API2Cart you can save both time and money, without the need to hire an entire team of developers to manage complex integrations and ongoing maintenance.

Amazon Integration With the Help of API2Cart

When it comes to developing connection with Amazon, there are a lot of benefits that eCommerce software providers can enjoy. First, integrating your solution with Amazon allows you to get all the data from the e-stores listed there.

Second, having a reliable connection with Amazon allows you to make your software's functionality available to all e-merchants that use it. This means that you will be able to grow your customer base extremely fast.

Besides, Amazon integration will allow you to expand your market share and become successful in the eCommerce markets of different countries.

Using API2Cart, you can integrate your B2B software with Amazon easily. API2Cart supports all the necessary API methods to ensure reliable and real-time synchronization with Amazon data. With their help, your system will be able to retrieve and manage all the data from this marketplace effectively and fast.

Let’s explore them below:

• for working with cart: cart.create/ list/ validate/ delete/ info
• for working with the product data: product.add/ list/ count/ info/ update/ child_item.list
• for working with the orders: order.list/ count/ info

The detailed info on how to connect Amazon to API2Cart you can find in 'Amazon Connection Instruction'.

eBay Integration With the Help of API2Cart

The development of the integration with the eBay marketplace can be much easier if to use API2Cart. API2Cart has a great variety of API methods that you can perform during working with the data from eBay:

• for working with cart: cart.create/ list/ validate/ delete/ methods/ info
• for working with the product data: product.list/ count/ fields/ add/ update/ image.add/ image.delete/ child_item.list/ variant.update/ variant.delete
• for working with the categories: category.list/ count/ info
• for working with the orders: order.list/ count/ info/ update/ status.list/ financial_status.list/ shipment.add

The info on how to start working with eBay you can find in 'eBay Connection Instruction'.

Etsy Marketplace API Integration With the Help of API2Cart

More than 6 million sellers from 234 countries sell their goods through this marketplace. Therefore, developing a connection with Etsy can help eCommerce software companies like yours dramatically increase market share and expand their customer pool. Connection with Etsy allows you to offer high-end software services to millions of e-merchants using this marketplace.

Many software providers want to integrate with Etsy as it has great potential in the eCommerce market. With API2Cart, you can connect with this marketplace with no difficulties too.

Let’s explore API2Cart API methods that you can use for retrieving and managing the data from Etsy:

• for working with cart: cart.create/ list/ validate/ delete/ methods/ info
• for working with the product data: product.list/ count/ info/ fields/ add/ update/ delete/ image.add
• for working with the categories: category.list/ count/ info

The info on how to start working with Etsy you can find in 'Etsy Connection Instruction'.

Walmart Integration With the Help of API2Cart

Using API2Cart, you can also integrate your eCommerce software with Walmart.

Walmart marketplace is a platform for e-merchants to list and sell their products. Additionally, it is one of the main competitors of eBay and Amazon. Walmart has more than 150,000 active e-stores around the globe. For example, it is very popular in USA, India, United Kingdom, Brazil, Germany and Italy.

Discover API methods provided by API2Cart that you can use for retrieving and managing the data from this marketplace:

• for working with cart: cart.create/ list/ validate/ delete/ methods
• for working with the product data: product.list/ count/ info
• for working with the orders: order.list/ count/ info/ update/ status.list/ shipment.list

Find the info on how to start working with Walmart and manage the data from it 'Walmart Connection Instruction'.

Conclusion

So, marketplace integration is essential for the successful activity of those software and app providers that propose their services for online retailers. It is highly important for shipping management, marketing automation, order and inventory management, dropship automation software, and other similar eCommerce solutions.

The development of connection with Amazon, eBay, Etsy, and the other different marketplaces is very important. It allows the B2B software to access all the necessary data from the marketplaces' databases and manage it through their systems.

In conclusion, we would like to emphasize that the development of integration with the main marketplaces available on the market is necessary for those software vendors who want to be successful in 2025. However, this process is not so easy. It requires a lot of your time and other resources.

So, if you want to connect to various marketplaces quickly, you can do it with the help of API2Cart unified API.

API2Cart provides flexible pricing. In addition, we have detailed API docs, more than 100 methods for managing the data and tech customer support.

Moreover, we allow you to test our full functionalities for free for a period of 14 days. Get your FREE trial today!