[COMING SOON] Submit a CSV repayment report for downstream processing.

The request must be sent as multipart/form-data with required metadata and file fields.<br /> The metadata field is plain text whose value must be valid JSON.<br /> Metadata fields and CSV fields use camelCase names.<br /> Additional CSV columns are allowed and ignored by this endpoint.<br /> When validation fails, the response body contains grouped top-level and row-level errors.<br /> Sample metadata: { "reportId": "report-1", "transferId": "transfer-1", "currency": "GBP", "transferDate": "2024-01-01" } Sample CSV body: loan_id,payments_transmitted 11111111-1111-1111-1111-111111111111,123.45