How much do you tip for online food delivery?

We're doing some research into tipping habits for online delivery and I'm curious to pick your brain. If you order food online:

--Do you tip in cash or on your credit card?
--How much do you typically tip?
--Does that tip vary based on the restaurant or delivery experience?

I'm also curious to know what the default tip is on restaurants where you order online. For some I've seen as low as 10%.

Thanks, all!

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