I was extremely excited to see that repeats were going to be accessible from webhooks in 3.10, but I haven't seen anything showing how to access them yet. I created a survey yesterday in 3.10 that had a repeat to test it out and way the repeat listed in the expected return of the webhook, but upon submission, the repeat information didn't get passed along. I am sure there will be something added to the documentation eventually, but I wanted to see if I could get a little help since I will be setting up some forms soon that would really benefit from accessing the information directly without having to create an additional REST query of the related table to extract it.