Hi there! My name is Akshay and I'm a professional web and e-commerce developer with 7+ years of experience. I have worked with many script packages, including Magento, Drupal commerce, Woo-commerce, and WordPress. From what you've described, it sounds like you're looking for someone to help you fix your custom add to cart process in WordPress.
I understand how important it is for you to have this feature working correctly when you select an amount - it should be selected and then ajax added to cart after pressing the "Dona Hoy" button. As a developer who has worked with many script packages before, I am confident that I can deliver an excellent solution that meets your needs exactly. Plus, my skills include CSS, PHP, WordPress which would be useful for this project.
I'd love to discuss further how my skills could benefit you and help you reach your goals for this project! Please feel free to reach out if there's anything else you'd like to know or clarify about me or my services.
Regards
Kush