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How do you version APIs in Financial Technology?

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APIs, or application programming interfaces, are essential for financial technology (fintech) applications to communicate with each other and exchange data. However, APIs are not static and may change over time to add new features, fix bugs, or comply with regulations. How do you version APIs in fintech to ensure compatibility, security, and reliability? Here are some tips and best practices to follow.

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Imed Tag

Empowering Solutions: Azure Architecture, Generative AI, DevOps & Software Engineering
Alex Ischenko

VP of Engineering | CTO | Public Speaker | Transformational Leader

1 Why version APIs?

Versioning APIs means assigning a unique identifier to each version of an API, such as a number, a date, or a name. Versioning helps developers and users to track the changes in an API, avoid breaking changes, and support multiple versions of an API simultaneously. Versioning also enables backward compatibility, which means that older versions of an API can still work with newer versions of an application, and vice versa.

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Imed Tag

Empowering Solutions: Azure Architecture, Generative AI, DevOps & Software Engineering
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Imagine pouring your heart into crafting an app, only to have its foundation—the API—shift. API versioning is your tech superhero, adding new features without evicting users. Developers use the old version while you add features in the latest one. It's like adding floors to a building without chaos. Versioning lets you experiment, like adding a teleporting kitchen. If issues arise, you close the door on that version, keeping the API rock-solid. It's not just upgrades; it's peace of mind, flexibility, ensuring everyone—from seasoned developers to app enthusiasts—glides smoothly through your tech ecosystem. That's worth celebrating!

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Alex Ischenko

VP of Engineering | CTO | Public Speaker | Transformational Leader
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Versioning in APIs, especially in Fintech, is very important for: - Compatibility. Ensures updates don't disrupt existing connections. -Regulatory Compliance Helps adjust to new laws without causing big changes to the system. - Security Safely introduces updates without compromising data protection. - Innovation Facilitates the rollout of new features to meet evolving user needs. -User Experience Maintains a smooth experience for customers, promoting trust and reliability in financial services.

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2 How to version APIs?

When versioning APIs, the most common methods are URL versioning, header versioning, and media type versioning. URL versioning involves adding the version number to the URL path or query parameter of an API endpoint, like /api/v1/users or /api/users?version=1. Header versioning requires adding the version number to the HTTP header of an API request or response, for example Accept: application/vnd.example.v1+json or Content-Type: application/vnd.example.v1+json. Lastly, media type versioning involves adding the version number to the media type of an API request or response, such as application/json;version=1 or application/xml;version=2. Each method has its advantages and disadvantages, so the choice depends on the preferences and requirements of the API provider and consumer.

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Georgio Khachan

Vice President | Digital Payments | Fintech Consultant | Card Acquiring | Product Management | Project Management | Strategic Planning | Analytics
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URL versioning leads to longer URLs so not aesthetically nice. Header versioning is cleaner to implement and better for tracking.

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3 What to consider when versioning APIs?

Versioning APIs is not only a technical decision, but also a business and strategic one. When deciding how to version APIs, frequency, scope, communication, and support should all be taken into consideration. For instance, releasing too many versions may be annoying to users while releasing too few may limit innovation. Additionally, certain changes may require a new version and a migration plan. It is important to document versions clearly and transparently, and inform users of any upcoming changes or deprecations. Furthermore, you should define a policy and timeline for supporting and retiring old versions while providing resources and guidance for users to upgrade.

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Alex Ischenko

VP of Engineering | CTO | Public Speaker | Transformational Leader
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It is very important to find a proper balance for versioning APIs. Document API versions clearly and transparently. Provide comprehensive documentation that outlines changes, new features, and any potential breaking changes. There are plenty of tools that can help automatically generate documentation, so human errors and typos can be excluded.

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4 How to test and monitor your API versions?

Testing and monitoring your API versions are essential for guaranteeing their quality and performance. Automated testing with tools such as Postman, SoapUI, or JMeter can help verify the functionality, reliability, and security of your API versions. Version control tools like Git, GitHub, or Bitbucket can manage and track changes in your API code and documentation, while also allowing collaboration with team members and stakeholders. Lastly, API management tools such as Apigee, MuleSoft, or Kong can be used to design, deploy, manage, and analyze your API versions, as well as control their access, usage, and performance.

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5 How to learn more about API versioning?

API versioning is a complex and evolving topic, and there is no one-size-fits-all solution. Nevertheless, there are some resources and examples that can help you learn more about it, such as API Versioning Best Practices by Vinay Sahni, RESTful API Versioning Insights by Guy Levin, API Versioning Has No “Right Way” by Phil Sturgeon, and Versioning APIs at Stripe, GitHub, and Twilio. These can offer insights into the different approaches to API versioning and provide valuable guidance for your own implementation.

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6 Here’s what else to consider

This is a space to share examples, stories, or insights that don’t fit into any of the previous sections. What else would you like to add?

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Alex Ischenko

VP of Engineering | CTO | Public Speaker | Transformational Leader
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- Set up regular and reliable release cycles so users can easily predict when new versions will be available. This consistency helps with planning for updates and reduces uncertainty for users who depend on your API. Make sure to clearly communicate release schedules and stick to them. - Create ways to gather feedback from users about changes to the API. This could involve surveys, forums, or direct communication channels. Getting input from users helps find any issues, understand satisfaction levels, and prioritize features. This ensures that updates to the API match what users need. - Create strong testing plans to make sure new versions work well and can be used with different systems. Use automated testing for various situations.

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How do you version APIs in Financial Technology?

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6

1 Why version APIs?

2 How to version APIs?

3 What to consider when versioning APIs?

4 How to test and monitor your API versions?

5 How to learn more about API versioning?

6 Here’s what else to consider

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How do you version APIs in Financial Technology?

1

2

3

4

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6

1 Why version APIs?

2 How to version APIs?

3 What to consider when versioning APIs?

4 How to test and monitor your API versions?

5 How to learn more about API versioning?

6 Here’s what else to consider

Financial Technology

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