WIP: api,client: allow overrides for CCD, WEB transfers

[adamdecaf]

This is an idea for re-adding CCD(+) and WEB transfers back into PayGate. The idea being you override this additional JSON object.

Updates #517
Updates #518

[codecov-commenter]

Codecov Report

Merging #519 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #519   +/-   ##
=======================================
  Coverage   53.47%   53.47%           
=======================================
  Files          97       97           
  Lines        3680     3680           
=======================================
  Hits         1968     1968           
  Misses       1363     1363           
  Partials      349      349           

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[adamdecaf]

I started a branch that checks the Customer type of the Source and creates a CCD batch when it's a business.