Do not reduce the balance early
A promise has no effect on the outstanding ledger until a real payment is received and allocated.
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Payment promise
A promised date needs a recorded follow-up.
Record who made the promise, the amount, the exact promised date and the communication source. Check the bank or ledger on that date and record the outcome separately.
Respond to a missed promise
Preserve the earlier promise, record that it was missed and choose the next proportionate action from the current facts.