Not exactly but it is possible. Think about people checking into an event. There could be 3 staff members checking people in, they each scan a QR code for each person entering and give them something on entrance, and then press confirm, which triggers the webhook. So there could be a few triggering very close together.
Im not filled with confidence. Would be a shame if the solution failed at this stage! It’s pretty much complete from a solution design perspective. This is essentially the first stage of UAT and it’s errored at the first hurdle
My understanding is that webhooks are triggered client side. So in the scenario you described above, each client would be sending a single webhook. Have you tested with 4 separate clients all triggering the action at the same time? I’d be shocked if that doesn’t work as expected.