As someone who has worked on a similar product, I would imagine they only store a token given to them by their payment gateway. The actual CC information is held by the PCI compliant payment gateway, while Docusign can use the token to charge a card without storing compromising information.
Would be good if that were spelled out though. From the outside, you click a link and see a pre-filled PDF, as both the end user and the person that sent the form. There's no obvious magic that it's auto-detecting cc like data and storing it differently than the other fields in the pdf.
So if I'm understanding you correctly, you're a junior dev who wants to have a mentee? Shouldn't you be more concerned with finding a mentor at this point in your career? I suppose you could start with mentoring college and high school students who are interested in entering the field. Just my two cents
I'm more of a mid-level dev really I would say, I'm a junior dev in title though. I'm quite confident in my code and work more or less autonomously without much issue, but I feel like in order to start moving towards the next level mentoring is a skill I need I'm just not sure where to start. How do you recommend finding high school and college students to mentor if I were to go that route?