We handle incentives using Tremendous as our API. It's very good, covers the vast majority of countries, and lets us payout in cash cards, Amazon gift cards etc - we let the participants pick their preferred method.

By plugging into the API and handling all the scheduling + interviews in the same place it means we can automatically payout folks who attend, generate reports on spending and help manage budgets without needing to skip between multiple tools.

re: 2 Yes! Would love to hear more about your particular use case. Want to drop me a note at ned@greatquestion.co?