curl --request POST \
  --url https://api-sandbox.endl.io/api/v0/accounts/cus_9FpQ2LmZ8sW4TxKn1BvD \
  --header 'API-KEY: <api-key>' \
  --header 'Api-Version: 2026-09.1' \
  --header 'Content-Type: application/json' \
  --data '{ "currency": "GBP", "accountName": "Acme Ltd GBP", "walletId": "wlt_3HdR9zNc6QeW2XmT5bLa", "displayName": "Acme GBP Operating", "accountCategory": "ONRAMP" }'

{
  "id": "acct_7Kq2XbN4mR8vLp1DcYtZ",
  "name": "Acme Ltd GBP",
  "displayName": "Acme GBP Operating",
  "status": "ACTIVE",
  "category": "ONRAMP",
  "currency": "GBP",
  "balance": { "amount": "0.00", "currency": "GBP" },
  "createdAt": "2026-09-02T11:41:07Z",
  "updatedAt": "2026-09-02T11:41:07Z"
}

{
  "code": 400,
  "message": "User id is required",
  "status": "ERROR",
  "data": null,
  "errors": [
    {
      "code": "ERRACC_1000",
      "message": "User id is required",
      "field": "userId"
    }
  ]
}

{
  "code": 401,
  "message": "Partner API key required",
  "status": "ERROR",
  "data": null,
  "errors": [
    {
      "code": "ERRCORE_1004",
      "message": "Partner API key required",
      "field": null
    }
  ]
}

{
  "code": 403,
  "message": "Insufficient permissions",
  "status": "ERROR",
  "data": null,
  "errors": [
    {
      "code": "ERRCORE_1005",
      "message": "Insufficient permissions",
      "field": null
    }
  ]
}

{
  "code": 404,
  "message": "Wallet 'wlt_…' not found",
  "status": "ERROR",
  "data": null,
  "errors": [
    {
      "code": "ERRREF_1001",
      "message": "Wallet 'wlt_…' not found",
      "field": "walletId"
    }
  ]
}

{
  "code": 405,
  "message": "HTTP … is not supported for this endpoint",
  "status": "ERROR",
  "data": null,
  "errors": [
    {
      "code": "ERRCORE_1001",
      "message": "HTTP … is not supported for this endpoint",
      "field": null
    }
  ]
}

{
  "code": 409,
  "message": "An account already exists for this currency",
  "status": "ERROR",
  "data": null,
  "errors": [
    {
      "code": "ERRACC_1006",
      "message": "An account already exists for this currency",
      "field": null
    }
  ]
}

{
  "code": 415,
  "message": "Content type … is not supported; use application/json",
  "status": "ERROR",
  "data": null,
  "errors": [
    {
      "code": "ERRCORE_1001",
      "message": "Content type … is not supported; use application/json",
      "field": null
    }
  ]
}

{
  "code": 429,
  "message": "Rate limit exceeded, please retry later",
  "status": "ERROR",
  "data": null,
  "errors": [
    {
      "code": "ERRCORE_1006",
      "message": "Rate limit exceeded, please retry later",
      "field": null
    }
  ]
}

{
  "code": 500,
  "message": "An error occurred while processing your request",
  "status": "ERROR",
  "data": null,
  "errors": [
    {
      "code": "ERRCORE_1000",
      "message": "An error occurred while processing your request",
      "field": null
    }
  ]
}