Fix Form Bug & Razorpay

I have a functionality issue on my site: every time a user submits a form an error message appears and the data never reaches my end. Once that form-submission bug is gone, I also want Razorpay added as the payment gateway... (Budget: ₹1500 - ₹12500 INR, Jobs: Backend Development, CSS, HTML, JavaScript, MERN Stack, MongoDB, Payment Gateway Integration, PHP, Web Development, WordPress)