I need to send clients a secure one-time link
Clients input their login credentials through that link
Link self-destructs after submission
Submitted information is only visible to me (Inprivy admin)

What I'm seeing:
It appears that once a user inputs their secret, a shareable URL is created - which suggests the information is stored and accessible via link rather than being directly submitted to me and deleted.

Is the submitted information encrypted and stored on Inprivy's platform?
Does the input link delete after first use?
Can only I view what was submitted, or does the shareable URL allow the client to access it again?

My use case: Securely collecting client login credentials via one-time self-destructing links that only I can access after submission.
Is Inprivy the right tool for this, or am I misunderstanding the workflow?
Thanks