add moonpay buy option

[fossephate]

Issue Number (if Applicable): Fixes #

Description

Please include a summary of the changes and which issue is fixed / feature is added.

Pull Request - Checklist

• [ ] Initial Manual Tests Passed
• [ ] Double check modified code and verify it with the feature/task requirements
• [ ] Format code
• [ ] Look for code duplication
• [ ] Clear naming for variables and methods