Hi Laurie,
Thanks so much for your interest in our plugins! I’m afraid that we do not offer support for paid event submissions with our plugins at this time. I’m sorry to disappoint! 🙁 We do receive a number of requests for this feature and have drafted plans to incorporate it into a future release–if you’d like to vote your interest, submit a comment, or just track the progress of this feature, you can do so right here on UserVoice.
Again, I’m sorry to be the bearer of bad news here! Thanks again for your interest, and we wish you the best of luck with your project!