1) When integrating payment gateways like Stripe or PayPal, what are the security and performance concerns you focus on? Can you describe how you handle webhook verification, retries, and transaction integrity in a high-volume environment?*
2)How do you ensure your APIs are thoroughly tested? Describe your approach to unit testing, integration testing, and end-to-end testing, particularly for edge cases and failure scenarios.*
3)What strategies do you use to handle large file uploads or downloads in a PHP API while maintaining performance and stability? Can you discuss how you handle issues like memory limits, timeouts, and partial file uploads?
4)When managing long-term PHP projects with multiple API integrations and evolving client requirements, how do you prioritize tasks? Can you share an example where you successfully managed scope changes or competing priorities?*
5)How do you ensure your API desiign adheres to RESTful best practices? Can you provide an example of a project where you had to refactor an API to make it more RESTful, and what the impact was on performance and maintainability?*
6)In large-scale PHP projects, how do you ensure your code remains clean and maintainable? Discuss principles like SOLID, DRY, or KISS, and explain how you apply them in your code reviews and daily development.*
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