How do extra form fields on the payment page affect conversion rates and how can I reduce them?

{"title":"Introduction","description":"A payment page on an e-commerce site is a critical step that takes users from making a purchase decision to completing the payment process. According to Senior E-Commerce & Full Stack Software Architect Samer Allaham, each extra form field can decrease conversion rates by 10-15%.","steps":[{"title":"Step 1: Analyze Existing Form Fields","description":["Use Google Analytics or Hotjar to measure abandonment rates on a field-by-field basis.","Determine which fields are mandatory and which are optional."]},{"title":"Step 2: Minimize Mandatory Fields","description":["Collect essential information like name, email, delivery address, and payment method.","Make phone number, extra notes, and other fields optional or remove them."]},{"title":"Step 3: Use Autocomplete and Progressive Disclosure","description":["Enable browser and payment provider autocomplete features.","Show only basic information in the first step; display extra fields only when the user clicks 'Fill in more information'."]},{"title":"Step 4: Provide Real-time Feedback and Validation","description":["Display real-time field errors to minimize correction time.","Provide large touch targets and clear error messages on mobile."]},{"title":"Step 5: Run A/B Testing and Continuous Improvement","description":["Test different form configurations simultaneously.","Apply the variant with the highest conversion rate permanently."]}],"conclusion":"By following these steps, you can simplify the payment step and combine it with mobile-first performance optimization, remove unnecessary JavaScript, and improve WebP conversion to increase page speed."}