Transaction Recovery

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i -X POST 'https://phion.systems/v1/paid/transaction-recovery' \
  -H 'content-type: application/json' \
  --data-raw '{"assurance":{"acceptance_satisfied":false,"delivery_verified":false,"failed_checks":["successful_status"],"payment_settled":true,"request_sha256":"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa","verdict":"disputed"},"attempts":[],"payment":{"amount":"15000","asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","network":"eip155:8453","recipient":"0x0000000000000000000000000000000000000001","transaction":"0xexample"},"policy":{"allowed_actions":["retry","request_refund","escalate"],"deadline":4102444800,"max_attempts":1,"refund_endpoint":"https://seller.example/refunds"},"transaction_id":"purchase-42"}'

# x402 v2 sends the challenge base64-encoded in the PAYMENT-REQUIRED header (v1 sends it in the body).
# To read the header:
curl -sS -g -o /dev/null -D - -X POST 'https://phion.systems/v1/paid/transaction-recovery' \
  -H 'content-type: application/json' \
  --data-raw '{"assurance":{"acceptance_satisfied":false,"delivery_verified":false,"failed_checks":["successful_status"],"payment_settled":true,"request_sha256":"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa","verdict":"disputed"},"attempts":[],"payment":{"amount":"15000","asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","network":"eip155:8453","recipient":"0x0000000000000000000000000000000000000001","transaction":"0xexample"},"policy":{"allowed_actions":["retry","request_refund","escalate"],"deadline":4102444800,"max_attempts":1,"refund_endpoint":"https://seller.example/refunds"},"transaction_id":"purchase-42"}' \
  | grep -i '^payment-required:' | cut -d' ' -f2 | tr -d '\r' | base64 --decode

// npm i @x402/fetch @x402/evm viem
import { wrapFetchWithPayment, x402Client } from "@x402/fetch";
import { registerExactEvmScheme } from "@x402/evm/exact/client";
import { privateKeyToAccount } from "viem/accounts";

// Pays at most $0.01 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.01" });
registerExactEvmScheme(client, { signer: privateKeyToAccount(process.env.EVM_PRIVATE_KEY) });
const pay = wrapFetchWithPayment(fetch, client);

// Not sure it's safe to pay? ToolVet checks it first for $0.005. Pay for that from a separate
// client: this one is capped at $0.01 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fphion.systems%2Fv1%2Fpaid%2Ftransaction-recovery&method=POST
const res = await pay("https://phion.systems/v1/paid/transaction-recovery", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "assurance": {
      "acceptance_satisfied": false,
      "delivery_verified": false,
      "failed_checks": [
        "successful_status"
      ],
      "payment_settled": true,
      "request_sha256": "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa",
      "verdict": "disputed"
    },
    "attempts": [],
    "payment": {
      "amount": "15000",
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "network": "eip155:8453",
      "recipient": "0x0000000000000000000000000000000000000001",
      "transaction": "0xexample"
    },
    "policy": {
      "allowed_actions": [
        "retry",
        "request_refund",
        "escalate"
      ],
      "deadline": 4102444800,
      "max_attempts": 1,
      "refund_endpoint": "https://seller.example/refunds"
    },
    "transaction_id": "purchase-42"
  }),
});
console.log(res.status, await res.text());

# pip install "x402[requests,evm]"
import os
from eth_account import Account
from x402 import x402ClientSync
from x402.http.clients import x402_requests
from x402.mechanisms.evm import EthAccountSigner
from x402.mechanisms.evm.exact.register import register_exact_evm_client

# Pays at most $0.01 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.01"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.post(
        "https://phion.systems/v1/paid/transaction-recovery",
        json={
            "assurance": {
                "acceptance_satisfied": False,
                "delivery_verified": False,
                "failed_checks": [
                    "successful_status",
                ],
                "payment_settled": True,
                "request_sha256": "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa",
                "verdict": "disputed",
            },
            "attempts": [],
            "payment": {
                "amount": "15000",
                "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
                "network": "eip155:8453",
                "recipient": "0x0000000000000000000000000000000000000001",
                "transaction": "0xexample",
            },
            "policy": {
                "allowed_actions": [
                    "retry",
                    "request_refund",
                    "escalate",
                ],
                "deadline": 4102444800,
                "max_attempts": 1,
                "refund_endpoint": "https://seller.example/refunds",
            },
            "transaction_id": "purchase-42",
        },
    )
    print(res.status_code, res.text)