Required Inputs
ZipCode
Must follow the correct format: NNNN-NNN
NNNN-NNN
Example: 7000-021
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