getting a padron

Hi all....I have read on line that you can apply for a padron in person,through a representative or on line.

It seems that online you have to register through cl@ve to get firstly a letter of invitation to be on cl@ve containing a CSV number...The web site doesn't work so I can't register so fell at the first hurdle!

Does anyone know if it is correct that a representative can apply at the town hall as I can't get out there myself from UK due to covid.

I am shipping aload of personal items out for presonal use and have been advised to get a padron  for customs clearance or be charged VAT on all my goods.....HELP