curl --request POST \
  --url https://api.getovra.com/v1/mandates \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "agent_id": "<string>",
  "expires_at": "2023-11-07T05:31:56Z",
  "constraints": {
    "maxAmountPerTransactionCents": 2,
    "maxAmountPerDayCents": 2,
    "maxAmountPerMonthCents": 2,
    "maxTotalAmountCents": 2,
    "maxUsageCount": 2,
    "allowedMccs": [
      "<string>"
    ],
    "allowedMerchants": [
      "<string>"
    ],
    "allowedCountries": [
      "<string>"
    ]
  },
  "challenge_id": "<string>",
  "assertion": {}
}
'

{
  "error": "<string>"
}