ClawPurse
402 Gateway

import requests, subprocess, os

res = requests.get("http://gateway:4020/api/data")

if res.status_code == 402:
    inv = res.json()["payment"]

    # Pay with ClawPurse
    subprocess.run([
        "clawpurse", "send",
        inv["address"], inv["amount"],
        "--memo", inv["memo"], "--yes"
    ])

    # Retry with proof
    res = requests.get(
        "http://gateway:4020/api/data",
        headers={"X-Payment-Proof": inv["invoiceId"]}
    )

data = res.json()

async function paidFetch(url: string) {
  let res = await fetch(url);

  if (res.status === 402) {
    const { payment } = await res.json();

    // Pay with ClawPurse
    const { send, loadKeystore }
      = await import("clawpurse");
    const { wallet, address }
      = await loadKeystore(
          process.env.CLAWPURSE_PASSWORD!
        );
    await send(
      wallet, address,
      payment.address, payment.amount,
      { memo: payment.memo }
    );

    // Retry with proof
    res = await fetch(url, {
      headers: {
        "X-Payment-Proof": payment.invoiceId
      }
    });
  }
  return res.json();
}