> For the complete documentation index, see [llms.txt](https://mogami.gitbook.io/mogami/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://mogami.gitbook.io/mogami/learning/protocol-explanation-v1/payment-verification-on-server.md).

# Payment verification on server

If we received a payment in the `X-PAYMENT` header, the server should now checked if it fulfills the corresponding requirement. The server can verify if the Payment Payload is valid either via local verification or by posting the Payment Payload and Payment Requirements to the `/verify` endpoint of a facilitator like <https://www.x402.org/facilitator/verify>

The documentation explaining how to interact with the `/verify` endpoint is here: <https://github.com/coinbase/x402?tab=readme-ov-file#facilitator-types--interface>. This is what we have to send:

```json
{
  "x402Version": 1,
  "paymentPayload": {
    "x402Version": 1,
    "scheme": "exact",
    "network": "base-sepolia",
    "payload": {
      "signature": "0xc2c261db2f352e47049c68a9f96be3a46f0dda5138ec04fc9a0462f0d32c531d31a31b26c1b7852978b9db3ccc5ea4839de25ca4c17fee47f7344d420128ceb11b",
      "authorization": {
        "from": "0x2980bc24bBFB34DE1BBC91479Cb712ffbCE02F73",
        "to": "0x2980bc24bBFB34DE1BBC91479Cb712ffbCE02F73",
        "value": "1000",
        "validAfter": "1747601321",
        "validBefore": "1747601441",
        "nonce": "0xa5f2264bcb079c96f07d9fe1378f5f846e3acd5ea29024d740cec881e2e85fe6"
      }
    }
  },
  "paymentRequirements": {
    "scheme": "exact",
    "network": "base-sepolia",
    "maxAmountRequired": "1000",
    "resource": "http://localhost:4021/weather",
    "description": "",
    "mimeType": "",
    "payTo": "0x2980bc24bBFB34DE1BBC91479Cb712ffbCE02F73",
    "maxTimeoutSeconds": 60,
    "asset": "0x036CbD53842c5426634e7929541eC2318f3dCF7e",
    "extra": {
      "name": "USDC",
      "version": "2"
    }
  }
}
```

And this is the kind of result we expect:

```json
{
  "isValid": false,
  "invalidReason": "invalid_scheme",
  "payer": "0x2980bc24bBFB34DE1BBC91479Cb712ffbCE02F73"
}
```

You can test it with curl:

```bash
curl -X POST https://www.x402.org/facilitator/verify \
  -H "Accept: application/json, text/plain, */*" \
  -H "Content-Type: application/json" \
  -H "User-Agent: axios/1.8.4" \
  -H "Accept-Encoding: identity" \
  -d '{
  "x402Version": 1,
  "paymentPayload": {
    "x402Version": 1,
    "scheme": "exact",
    "network": "base-sepolia",
    "payload": {
      "signature": "0xc2c261db2f352e47049c68a9f96be3a46f0dda5138ec04fc9a0462f0d32c531d31a31b26c1b7852978b9db3ccc5ea4839de25ca4c17fee47f7344d420128ceb11b",
      "authorization": {
        "from": "0x2980bc24bBFB34DE1BBC91479Cb712ffbCE02F73",
        "to": "0x2980bc24bBFB34DE1BBC91479Cb712ffbCE02F73",
        "value": "1000",
        "validAfter": "1747601321",
        "validBefore": "1747601441",
        "nonce": "0xa5f2264bcb079c96f07d9fe1378f5f846e3acd5ea29024d740cec881e2e85fe6"
      }
    }
  },
  "paymentRequirements": {
    "scheme": "exact",
    "network": "base-sepolia",
    "maxAmountRequired": "1000",
    "resource": "http://localhost:4021/weather",
    "description": "",
    "mimeType": "",
    "payTo": "0x2980bc24bBFB34DE1BBC91479Cb712ffbCE02F73",
    "maxTimeoutSeconds": 60,
    "asset": "0x036CbD53842c5426634e7929541eC2318f3dCF7e",
    "extra": {
      "name": "USDC",
      "version": "2"
    }
  }
}'
```