Follow-up from "Enable transferring tickets between implicit accounts"

The following discussion from !6108 (merged) should be addressed:

• @sribaroud started a discussion: (+2 comments)

  NIT:

  This new module is a bit strange to me. What not simply add an argument to each function?

  I don't really mind and the test is correct and soon replaced by a better one no? (as said in !6108 (comment 1117461206))