I used to work at a company that behind the scenes had to use a web UI in a weird/novel way for their system to work. This company's web UI would allow its use

I used to work at a company that behind the scenes had to use a web UI in a weird/novel way for their system to work. This company's web UI would allow its users to initiate bank transactions. Nothing weird from the user's end. However, the company had to "approve" the transactions in real time, synchronously. The company could do all sorts of programmatic verification on the user, recipient, transaction, etc, but we had to actually physically press a button on the screen of a smart telephone to approve the transaction. There was no programmatic way around this. Some programmers at the company came up with a robotic arm which could be controlled programmatically, which would do the telephone screen pressing for us. I always thought that was pretty clever.