How to Call an External API from Workflow or Formula (ViaCEP for Address Autofill)

[item]

Hi,
I think theses two link is for your question :

https://docs.espocrm.com/administration/workflows/#send-http-request

https://docs.espocrm.com/administration/workflows/#handling-http-response

[Jean Daste]

Hi everyone,

I'm working on a custom implementation and would like to know if it's possible to call an external API directly from a Workflow or Formula in EspoCRM.

Here’s my scenario:

I have a field called CEP (which is a Brazilian postal code). I want to automatically fetch and populate address fields like street, city, and state using the ViaCEP API, which returns this data based on the provided CEP.

Example API:

https://viacep.com.br/ws/01001000/json/

I’ve explored using Workflows and Formulas, but it seems they don’t support external API calls directly.
Is there a recommended approach for doing this?
Maybe through hooks or custom service classes?

Any suggestions or examples would be greatly appreciated!