A new endpoint is available for POS systems to submit check details associated with a posting account (house or group account). The behaviour mirrors POST /reservations/{id}/pos_check_detail: each line break (\n) in the submitted details string is treated as a separate line item on the POS check in the PMS.

The reference_number must match the POS check number previously submitted via POST /posting_accounts/{id}/transactions. If no match is found, the request fails with HTTP 422.

Example request:

{
  "reference_number": 12345,
  "details": "POS Check - Poolside Café\nDate: 2025-06-16 13:10\nCovers: 3\nTable: 7\nServer: Mia R\n\n1x Caesar Salad $12.00\n2x Club Sandwich $28.00\n3x Iced Tea $9.00\n\nSubtotal $49.00\nTax $4.90\nService Charge $2.45\nTip $6.00\n\nTotal $62.35\n\nThank you!"
}