GET - https://subscribercrmapi.oss.org.uk/api/payment/{id}

Get an individual Payment.

{
"Id": 1,
"ContactId": 1234,
"DemandId": 567,
"Amount": 50.0,
"TransactionDate": "2026-07-16T00:00:00+00:00",
"Comments": "ABC123",
"PaymentMethodId": 1
}