I'd like to preface that I don't know if this is the best solution, but this is what we did.
We wanted to give out an Amazon gift card to users. We worked off the raffle doc page as a base: https://www.qualtrics.com/support/survey-platform/common-use-cases-rc/creating-an-anonymized-raffle/
Note especially the bit at the top to try and prevent people from just blasting through the survey for the gift card (e.g. making sure people can't take the survey more than once - check the ballot box stuffing in survey options. but the user can clear their cookies or use a different browser to get around that... incentives are inherently risky).
To keep it anonymous, we had 2 surveys , just like the raffle page has- one with the actual questions, and a second that asked for the user's email for the gift card.
For the main survey, referring to the raffle page, instead of having a question in the survey "Would you like to enter the raffle" as in the docs, we just changed the regular survey flow end to be the 2nd survey.
Then we followed most of the steps in "Survey Flow: Manual Raffle" since we wanted to copy the flow but weren't actually having a raffle. (Don't forget step 6 there with the referer).
Then we just checked the data tab regularly to see the email addresses to send the gift cards to.

https://www.qualtrics.com/community/discussion/comment/27247#Comment_27247Thank you so much for your input and suggestions riceball. I guess there might be no way around manually sending out gift card codes to participants. With our large sample I was hoping to find a way which automatically sends gift card codes. Nonetheless, I really appreciate your quick reply and help!

Hi btran97
did you find a way to automatically send gift card codes? We would like to do the same , we will have email addresses, but would prefer not to have to email individually. If you worked out a solution we'd be grateful to know it!

While I have not had an opportunity to use incentives, I remember meeting with Rybbon at X4 in 2019. They are another integration service that seem to have some positive features - I especially liked that you receive a 100% refund for any unclaimed rewards. They were also able to track receipt, which is mandatory requirement of any incentives at my university.
https://www.qualtrics.com/marketplace/rybbon-integration/

Hello Everyone,
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Wouldn't this result in connecting the email ids to the responde IDs?

Bhnrewards.com offers a gift card solution designed to incentivize surveys while ensuring the anonymity of respondents