curl --request POST \
  --url https://api.dintero.com/v1/accounts/{oid}/signup \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "applicant": {
    "email": "customer@example.com",
    "agreement": {
      "name": "<string>",
      "version": "<string>",
      "personal_guarantee_accepted": true,
      "attachments": [
        {
          "name": "Cookie Policy",
          "version": "<string>"
        }
      ]
    },
    "first_name": "John",
    "last_name": "Doe",
    "phone_number": "+4799999999",
    "recaptcha_sitekey": "6LdE_pIUAAAAAHbiL0uHjHg2Mgn2IILTvZdA_Ux-",
    "recaptcha_response": "03AOLTBLSbzmXKXuAz9N--DsZ1xWmhfx6okCheBPesOsNmRSdkfcO4E5CkeBQQFJkC_emfE_KF0P8C3T57Nr9eOon_PVTEIq1NUpRS5oGkGMhr1vxVe1F7txMYUc4ClxUDLxWiW5WgnDvWHC7gOnlJZKvxVE4gn7qAJijE6SFMXkvFOwoWcx_kONmBHGnXHGgxIe2M8G-FkIKr0WZbQIDYmDaiQxb6mL1L70UGOyO280v2Pp65JB1mSohdeJLdQhHeye6v6__H9_M0GxDGd8s-LoLUY5Vq9hKbAs8MCsh2OFwtpbTYGfqmDbTwsc2v8SqOOZ86uKXwl7gyk3RHXT27m8Rv8iZAs2Ym5w",
    "promo_code": "<string>",
    "signup_reference": "<string>",
    "utm": {
      "utm_source": "google",
      "utm_medium": "cpc",
      "utm_campaign": "spring_sale",
      "utm_term": "running+shoes",
      "utm_content": "textlink"
    }
  }
}
'

{
  "error": {
    "message": "<string>",
    "code": "<string>",
    "errors": [
      {}
    ]
  }
}