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It is only possible to update billings that are pending payment or overdue. Once created, it is not possible to change the customer to which the billing belongs.
Update split after billing confirmation
Changes to splits are only allowed for billings made with credit or debit cards.
The latest date to make changes is up to 1 business day before the scheduled payment date.
You can only modify billings with a CONFIRMED status and no anticipation.
The only exception to the previous rules occurs when there is a block due to a split discrepancy at the time of receiving the billing. In this case, updating the split will be allowed for billings with the statuses CONFIRMED, RECEIVED, and even if the billing has anticipation. However, no other field besides the split can be updated.
In cases of automatic anticipation with a split configured by a fixed value at the billing issuance, the split calculation will consider the highest applicable fee for the credit card used.