Other signed fields.
Tokens in the answer.
What the call cost, in millionths of a US dollar.
The model id the call asked for.
The model id the upstream's own response named.
Tokens in the prompt.
Reasoning tokens in the answer. 0 when there were none.
Phantom AI's id for the call.
When the receipt was signed, as an ISO 8601 time.
The receipt format version. checkReceipt accepts only version 1.
The signed content of a receipt. pai reads the fields listed here; the server signs more (such as hashes of the request and response), and they pass through untouched.