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Required scope: accounting:write

The API credential calling this endpoint must be granted the accounting category with read & write access.
Scopes are assigned to the credential when it is created or edited in Pliant, not requested when obtaining the access token.
A credential without this scope receives 403 Forbidden with the error code INSUFFICIENT_PERMISSION.

Update the values of custom fields related to an accounting transaction. All custom fields need to be provided, by not providing a custom field, the value of that custom field will be removed, i.e. set to null.