[engine] Extending minds plus/pro subscriptions with additional purchases minds#4312

Ticket(s) / Related Merge Requests

• Issue card: minds#4312 (closed)
• Front MR: front!2450 (closed)

Summary of Changes

Ability to extend minds plus/pro subscriptions with additional purchases

Testing Considerations

Deployment Considerations

Regression Scope

Platform Affected (web, mobile, etc)

Developer Testing Completed

Screenshots / Screen Recording

Does this impact

• Localization
• Dark/light mode
• Guest mode

Definition of Done Checklist

• The Acceptance Criteria has been met
• Code is tested: Testing includes unit/spec, E2E/automated and manual testing
• Merge requests description has been filled out