[$50] Fix Billing Accounts

[rootelement]

Original Tech Debt Issue: #158

Legacy processor PR: topcoder-archive/legacy-challenge-processor#12
V5 API PR: #159

[ThomasKranitsas]

Contest https://www.topcoder.com/challenges/30129020 has been created for this ticket.

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[ThomasKranitsas]

Contest https://www.topcoder.com/challenges/30129020 has been updated - it has been assigned to thomaskranitsas.

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[ThomasKranitsas]

Payment task has been updated: https://software.topcoder.com/review/actions/ViewProjectDetails?pid=30129020

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