curl --request POST \
  --url http://localhost:4100/v1/projects/{projectId}/gas-policies/prepare \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "account": "<string>",
  "family": "safe",
  "agent": "<string>",
  "transfer": {
    "recipients": [
      "<string>"
    ],
    "maxPerActionBaseUnits": "<string>",
    "maxTotalBaseUnits": "<string>"
  },
  "mandate": {
    "validFrom": 140737488355328,
    "expiresAt": 140737488355328,
    "approvalExpiresAt": 140737488355328,
    "salt": "<string>"
  },
  "gas": {
    "maxPerActionWei": "<string>",
    "maxTotalWei": "<string>",
    "expiresAt": 140737488355328,
    "chargeableOutcomesMask": 4
  }
}
'

const options = {
  method: 'POST',
  headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    account: '<string>',
    family: 'safe',
    agent: '<string>',
    transfer: {
      recipients: ['<string>'],
      maxPerActionBaseUnits: '<string>',
      maxTotalBaseUnits: '<string>'
    },
    mandate: {
      validFrom: 140737488355328,
      expiresAt: 140737488355328,
      approvalExpiresAt: 140737488355328,
      salt: '<string>'
    },
    gas: {
      maxPerActionWei: '<string>',
      maxTotalWei: '<string>',
      expiresAt: 140737488355328,
      chargeableOutcomesMask: 4
    }
  })
};

fetch('http://localhost:4100/v1/projects/{projectId}/gas-policies/prepare', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

{
  "draftId": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "draftExpiresAt": "2023-11-07T05:31:56Z",
  "environment": "test",
  "chainId": 84532,
  "core": "<string>",
  "account": "<string>",
  "family": "safe",
  "review": {},
  "authority": {
    "mandateTerms": {},
    "mandatePolicy": "<string>",
    "gasPolicy": {},
    "mandateId": "<string>",
    "gasPolicyId": "<string>",
    "combinedDigest": "<string>"
  },
  "signing": {
    "family": "safe",
    "method": "eth_signTypedData_v4",
    "typedData": {
      "domain": {},
      "types": {},
      "primaryType": "<string>",
      "message": {}
    },
    "expectedHash": "<string>",
    "digest": "<string>",
    "signatureFormat": "safe_threshold"
  },
  "submission": {
    "to": "<string>",
    "functionName": "createMandateWithGas"
  }
}

{
  "error": {
    "code": "<string>",
    "message": "<string>",
    "correlationId": "3c90c3cc-0d44-4b50-8888-8dd25736052a"
  }
}

{
  "error": {
    "code": "<string>",
    "message": "<string>",
    "correlationId": "3c90c3cc-0d44-4b50-8888-8dd25736052a"
  }
}

{
  "error": {
    "code": "<string>",
    "message": "<string>",
    "correlationId": "3c90c3cc-0d44-4b50-8888-8dd25736052a"
  }
}

{
  "error": {
    "code": "<string>",
    "message": "<string>",
    "correlationId": "3c90c3cc-0d44-4b50-8888-8dd25736052a"
  }
}

{
  "error": {
    "code": "<string>",
    "message": "<string>",
    "correlationId": "3c90c3cc-0d44-4b50-8888-8dd25736052a"
  }
}

{
  "error": {
    "code": "<string>",
    "message": "<string>",
    "correlationId": "3c90c3cc-0d44-4b50-8888-8dd25736052a"
  }
}

{
  "error": {
    "code": "<string>",
    "message": "<string>",
    "correlationId": "3c90c3cc-0d44-4b50-8888-8dd25736052a"
  }
}

{
  "error": {
    "code": "<string>",
    "message": "<string>",
    "correlationId": "3c90c3cc-0d44-4b50-8888-8dd25736052a"
  }
}