The API specification: docs.connect.squareup.com/api/connect/v2#endpoint-createrefund
{
"refund": {
"amount_money": {
"amount": 100,
"currency": "USD"
},
"created_at": "2016-02-12T00:28:18Z",
"id": "b27436d1-7f8e-5610-45c6-417ef71434b4-SW",
"location_id": "18YC4JDH91E1H",
"reason": "some reason",
"status": "PENDING",
"tender_id": "TENDER_ID",
"transaction_id": "TRANSACTION_ID"
}
}