Solid uses status response codes to indicate the status of a transfer. Please note this is the status of the transfer sub-object only. For status codes of the whole transaction object, see this doc. Here is a list of potential transfer status codes and the transaction types they're associated with.
completed = transfer completed
pending = transfer in review or waiting for approval
declined = transfer declined
settled = transfer settled
approved = transfer approved
waitingForFiles = waiting for check images to be uploaded
