Hiring services to complete an MVP that uses Spree commerce developed in Ruby On Rails

Hello,
I'm in the process of creating an MVP and we need to do two integrations to the backend that is hosted on AWS EC2. A means of payment and a freight gateway.
We use the Spree framework, developed with Ruby on Rails, for the back-end.
Also, we need to create and connect some website button links to the backend
Below are services to be performed for the budget:
1) Integration with a payment method:
https://dev.pagseguro.uol.com.br/docs
2) Integration with a shipping portal:
https://frenetapi.docs.apiary.io/#
3) Change the Spree logo to my logo on the login pages and main page of the platform?
http://54.147.32.2/
http://54.147.32.2/admin/orders
http://54.147.32.2/admin/products

4) Change EC2 links to links from my domain that I bought and use on my Wix site. (www.venddix.com)
http://54.147.32.2/ change to www.venddix.com/lojaexamplo
http://54.147.32.2/signup change to www.venddix.com/criarecommerce
http://54.147.32.2/admin/orders change to www.venddix.com/admin
http://54.147.32.2/admin/products switch to www.venddix.com/adminloja

5) At the top of the website (www.venddix.com) there is a button called: "Start". I want to link this button to the domain www.venddix.com/adminloja, which will be the former http://54.147.32.2/admin/products
There are nine more buttons on the site that read "Create My Free Ecommerce" that I want to link to www.venddix.com/criarecommerce
6) Remove from footer: "Designed and developed by Spark Solutions"