ruby on rails devloper -- 2

We are looking for a ROR developer who can help to complete the website. We already have developed and completed a website in Ruby On Rails, we need some further features needs to be added. Smalls features list below for payment gate way : 1- able to edit the the payment table (text and price ) from the admin panel check attached file . , 2. ad my paypal Acount and check the setting of stripe if everything is correct 3- if user subcribe to plan they will able to view and take the exam for same period they subcribe and in user profile they know when ther subcribtion end my max budget for this work is 200 USD I can give the access to right candidate, thanks.