import Telnyx from 'telnyx';

const client = new Telnyx({
  apiKey: process.env['TELNYX_API_KEY'], // This is the default and can be omitted
});

const response = await client.simCards.actions.validateRegistrationCodes();

console.log(response.data);

{
  "data": [
    {
      "record_type": "sim_card_registration_code_validation",
      "registration_code": "0123456789",
      "valid": false,
      "invalid_detail": "This code has already been used."
    }
  ]
}