Full time Pay pal integration into ruby on rails application

Budget:15$,Minimum of 3+ years of experience with rails and APi integrations and payment gateways. Need to setup payment gateway,write actions,validations,call scripts in background,access levels only for paid users and make sure the flow is perfect with no errors and secure the application to production [login to view URL] pay pal gem for rails 6.x Need to start now. Need to have github for push/pulling code. Payment will be released upon completion and reviewing the code. Looking for long term relationship followed by other tasks. Dead line:1 day