Thanks, Erika.  That is what I was thinking might be a (the) solution.

I have already added PayTraQer as an integrator.

I already have current customers (~5,000) tokenization in BrainTree.

Can I use QuickBooks Payments to enter credit card information into QBO and then it passes that data (via PayTraQer) into BrainTree for processing?  Will current customer data be passed from BrainTree (via PayTraQer) into QB Payments so cc data can be edited in QBO? CAn they exist harmoniously  (QBO, QB Payments, PayTraQer, BrainTree)?