Anyone using Braintree for payments?

I'm currently a payments consultant for eCommerce companies and I'm building out a product that combines data across multiple payment processors (Stripe, Braintree, PayPal, etc.) into a single source that can be used for analytics and reconciliation. I have a lot of experience with Stripe, PayPal and Adyen but need someone to test building out and integration with Braintree. Their Sandbox account has too many limitations.

Does anyone have ideas as to how I could find someone willing to do this? I would not charge anything for my services