UPDATED 17:32 6/9/19 - added a link to where you can download the application form.
The recent article here about paying traffic fines online prompted a reader to ask about the digital signatures from the town hall (as you need one to be able to be able to pay traffic fines online).
Firstly I asked a contact associated with the Junta Local for Almerimar, Christine G, about digital signatures. Here was the response about who can get them and how to go about it:
"Anyone with an NIE number can get a digital signature, it doesn't matter if you are resident or non resident. You have to download the form to Solicitar Firma digital, you will then be issued with a code which you have to take to the town Hall in El Ejido with your passport and original NIE number and they will activate it for you. You have to do this either the same or next day after getting the code, otherwise the code will be invalidated. You can do this in the town hall between 8 and 13.00 . You need to get a ticket at the main desk to do this."
I have asked Christina for a link to where you can download the form. Rather than me search for it myself. In case I get it wrong. I will update this article once I have the link recommended by the council. Updated: here is the link.
Secondly, the reader provided a link to the article here in Spanish about digital signatures. My thanks to the reader who provided this link.
Read More for a Google translation of the article.