ACH bank drafts are not available as a payment type in TULessons, either for one time fees nor monthly fees. ACH can only be used for auto pay monthly swim team fees. People will need to pay Lessons fees with a credit card or cash/check.
The screenshot below makes this clear. Note how "Use for Lessons Specific Fees" is not available in the ACH Bank Account section.
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See Also
Find and fix credit card failures in monthly billing
Make on demand charges with credit cards