[Feature] Adds GraphQL client for Payments apps

[cmelendez]

WHY are these changes introduced?

Payments apps need to call an specific endpoint which is not supported by the standard GraphQL client

WHAT is this pull request doing?

It adds a new client (Payments) by extending the current Graphql client

Type of change

• [ ] Patch: Bug (non-breaking change which fixes an issue)
• [x] Minor: New feature (non-breaking change which adds functionality)
• [ ] Major: Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist

• [ ] I have added a changelog entry, prefixed by the type of change noted above
• [ ] I have added/updated tests for this change
• [ ] I have documented new APIs/updated the documentation for modified APIs (for public APIs)