Hello!
What I mean applies for free usage: when adding custom carriers, it allows setting up an URL to pass tracking number and dynamically build the URL, which for the user, is just a link to the carriers tracking web page. ESTAFETA particularly does not provide such a web page that can be configured this way (GET parameter at the URL).
Of course, when using a third party paid service such as TrackingMore, it does support ESTAFETA since they will perform POST calls to ESTAFETAs REST API. Which I had to code by myself.
Cheers
