Required Inputs

• ZipCode

  • Must follow the correct format: NNNN-NNN

  • Example: 7000-021

Optional Inputs

• SessionId

  • Can be included to maintain request context across multiple interactions.

  • If not provided, each request will be treated as independent.

Authentication

• CTT API Key

  • Required for accessing the CTT Postal Code API.

  • Users can obtain an API key at: https://www.cttcodigopostal.pt/api