Earlier quoted context omitted.
What earthly consumer is going to go through these steps? I have requested the removal of my personal data from multiple business, and I can assure you I'm quite earth-bound. Copy-pasting a template and filling in my name and account ID is not that hard.
I'm going to go out on a limb and guess that you are a fairly technical user. My snarkiness in the previous reply was excessive, but reflected my frustration with being told that something is simple that is actually a multi-step process with questions that are not easy to find the answer to. I guess the problem with email for this process is that you have a number of questions, all of which may not have an easy answe…
Regarding the content, they would find some template they can mostly understand, then change/add a paragraph to include whatever specifics they need.
As for verification of identify, they would not even think much about it. They would sign with their name, and of course send from their email. The company would have to reply back to ask for whatever they need to verify it properly.