curl --request POST \
  --url https://api.sandbox.sardine.ai/v1/auth/client-tokens \
  --header 'Authorization: Basic <encoded-value>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "referenceId": "<string>",
  "customerId": "<string>",
  "externalUserId": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "identityPrefill": {
    "firstName": "<string>",
    "lastName": "<string>",
    "dateOfBirth": "<string>",
    "emailAddress": "<string>",
    "phone": "<string>",
    "address": {
      "street1": "<string>",
      "street2": "<string>",
      "city": "<string>",
      "regionCode": "<string>",
      "postalCode": "<string>",
      "countryCode": "<string>"
    }
  },
  "paymentMethodTypeConfig": {
    "default": "us_debit",
    "enabled": [
      "us_debit"
    ]
  }
}
'

{
  "clientToken": "<string>",
  "expiresAt": "<string>"
}