Integrate Payment Gateway and a third-party LMS using API on WordPress website

Hi, I have a WordPress website with a Buy button. I am looking for someone who can integrate a payment gateway(CCavenue) with that. We are using LearnPress plugin on WordPress to show some courses with their fees. The idea is - When somebody clicks on Buy now on any course, that course should be added in cart. Then he can check out, it will take them to a form and then to the payment gateway. He can also go back and add more courses in the cart. After making the payment an email is sent to admin with the purchase details. The details are stored in WordPress backend. An email is also sent to the user with purchase details. - We can use woocommerce plugin for this. Also, we need to integrate with a third-party LMS([login to view URL]) using their API. The idea is - when the payment is made. The details of the user with the course it has purchased will be sent to LMS. An account will be created on LMS and those courses will be added in that account. If that same person makes a second purchase on the website using the same email id, that new course should be added to the existing account. We will have to make a few minor changes after the basic integrating is done, so there will be a bit back and forth between us to fine tune this. Plus there are a few small aesthetic changes also needs to be done, which I will inform once this is done. We have a deadline to complete this by Tuesday afternoon so looking for someone who can get this done asap - probably by Sunday or Monday morning. So we have a day for fine-tuning. Please reply with expected cost and the time it will take for you to complete it. Will send you the website details post that so you can evaluate it and confirm final price and timeline. Thanks.