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Overcoming the Absence of a Sandbox: Alternatives for Testing Third-Party API Integrations

Level of difficultyEasy
Reading time4 min

In today's fast-paced world of software development, integrating third-party APIs and services is a common practice. These integrations can enhance functionality, improve user experience, and provide additional features that would be time-consuming and costly to develop in-house. However, ensuring these integrations work seamlessly with your software is crucial, and this is where the importance of a test environment, or sandbox, comes into play.

A sandbox environment allows developers to test the integration between their software and third-party services without risking the stability and security of the production environment. This controlled setting enables thorough testing, helping to uncover issues before they affect end-users. By covering as many test cases as possible, developers can ensure robust and reliable integrations.

But what if your third-party provider, such as a bank or government e-system, does not offer a sandbox environment? This scenario can pose significant challenges, but there are several strategies you can employ to mitigate these issues.

Developing Your Own Mock Service

One solution is to develop your mock service. This approach allows you to implement only the parts of the API you need, without replicating the entire standard.

Suppose you are integrating with a payment gateway that does not provide a sandbox environment. You can create a mock service that simulates the payment gateway's API. This mock service can handle typical API requests and return predefined responses. For instance, when your application sends a payment request, the mock service can return a successful response or various error messages to simulate different scenarios.

Example of using own Mock Service
Example of using own Mock Service


  • Full control over the mock service.

  • Ability to simulate specific scenarios and edge cases.

  • No dependency on third-party availability.


  • Requires time and resources to develop and maintain.

  • Might not cover all aspects of the actual service, leading to potential gaps in testing.

Using an HTTP Proxy or Monitor

Another option is to use tools like Charles Proxy, Fiddler, or mitmproxy. These tools can capture and modify HTTP requests and responses between your software and the third-party service.

If you're integrating with a third-party API for weather data, you can use an HTTP proxy tool like Charles Proxy to intercept the API calls. You can then modify the responses to simulate different weather conditions. For example, you can change the response to simulate a rainy day, a sunny day, or an API error, allowing you to test how your application handles these different scenarios.

Example of using HTTP Proxy
Example of using HTTP Proxy


  • Easy to set up and use.

  • Allows real-time monitoring and debugging of requests and responses.

  • Can simulate various scenarios by modifying responses.


  • Does not provide a full simulation of the third-party service.

  • Requires technical knowledge to configure and use effectively.

  • Limited to HTTP/HTTPS traffic.

  • Preparing encrypted responses can be challenging if the service requires encryption, adding complexity to the setup.

Utilizing Existing Data

You can also use existing data and feed it directly into your system, such as inserting data into the database and then processing it as if it came from a third-party service.

Imagine you are integrating with a banking system that does not offer a sandbox. You have obtained a real response from the banking system, which includes a report of transactions. You save this response in a storage solution like Amazon S3 or your database. By doing this, you can repeatedly process this report in your system to test various functionalities, such as reconciliation, reporting, and error handling, without needing live API calls.

Example of using existing real data
Example of using existing real data


  • Quick to implement if you have access to relevant data.

  • Can test how your system processes real data.


  • Data might not cover all possible scenarios.

  • Potential security and privacy concerns if using sensitive data.

  • Does not test the actual integration point.

Requesting Temporary Access

Finally, you can request temporary access to a limited account from your third-party provider to test your integration.

If you're integrating with a banking API, you can request the bank to provide a temporary account with limited access. This account can be used to perform various transactions and queries to ensure that your integration works correctly. To cover different scenarios, you can test balance inquiries, incoming transfers, and error handling within this temporary account. For the outcoming transfers you have to handle it manually or ask your contact person by the partner.

Example of using a temporary account
Example of using a temporary account


  • Access to the real service, ensuring accurate testing.

  • Can cover a wide range of scenarios using actual API endpoints.


  • Dependent on the provider's willingness to grant access.

  • Limited time frame might not be sufficient for comprehensive testing.

  • Risk of affecting real users if not handled carefully.

Summary table


While having a sandbox environment is ideal for testing third-party integrations, it is not always available. By exploring and implementing alternative strategies such as developing your own mock service, using HTTP proxies, utilizing existing data, or requesting temporary access, you can still ensure robust and reliable integrations. Each approach has its pros and cons, and the best choice will depend on your specific needs and resources.

Ultimately, thorough testing is essential to deliver a seamless user experience and maintain the stability and security of your software. As developers and IT professionals, it is our responsibility to find innovative solutions to these challenges and ensure the highest quality in our integrations.