Context for question: response given after creating a new debit using Python library
created_at
is the timestamp of when the debit was created. available_at
is when funds will arrive in the escrow balance, available for use -- these are often not the same because ACH debits take time to propagate. This will normally be 1-2 business days after the debit was created for an ACH debit, or instantly for a credit card debit.