Hi Simon,
We have updated this endpoint to allow you to create one or more (unexplained) transactions in JSON or XML.
You can give the statement parameter as an array of transaction objects, each with a date, description and amount.
This update will not affect your existing CSV based integration, but rather just provides another way to upload transactions. However, this update should remove the need to to synthesise a CSV file for singular transactions.
Link to the announcement: Improvements to uploading statements
Link to the updated docs: https://dev.freeagent.com/docs/bank_transactions#upload-a-bank-statement
Thanks,
Iain