Release v39.0.0

[AdyenAutomationBot]

Merged pull requests to be released:

• PaymentsApp API unit tests #1509
• Improve testing #1511
• Code generation: update services and models #1512
• Handling unknown enum values #1514
• Code generation: update services and models #1515
• Code generation: update services and models #1516
• [Checkout] Skip serialisation of attributes with default values #1517
• [All APIs] Skip serialisation of attributes with default values #1518

Full Changelog: v38.3.0...main

[gemini-code-assist]

Summary of Changes

Hello @AdyenAutomationBot, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request represents an automated version bump for the adyen-java-api-library to v38.3.1. It updates all relevant version indicators across the project to reflect this new release, which incorporates previously merged changes from PR #1509.

Highlights

• Version Bump: The primary purpose of this pull request is to increment the library's version from 38.3.0 to 38.3.1.
• Metadata Updates: Various project files, including the Maven pom.xml, README.md, and an internal Client.java constant, have been updated to reflect the new 38.3.1 version.
• Automated Release: This PR appears to be an automated release, triggered by the merging of previous changes, specifically those from pull request #1509.

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[gemini-code-assist]

Code Review

This pull request updates the library version from v38.3.0 to v38.3.1 across the README.md, VERSION file, pom.xml, and the Client.java constant. The changes are consistent and correctly reflect the version bump. No issues of medium, high, or critical severity were found within the modified lines.