I insist on upfront payment from anyone who is doing their first transaction with me as a means of establishing trust. This is irrespective of the time you have spent on FP or the reputation you have gained. I see all my clients as equals.
In case you are cancelling, thats fine too. I wish you the very best.
Please take a look at https://marketing.themedically.com. It's a marketing / webmaster forum. I do try to focus on the medical niche more, but it's still a webmaster forum after all. If you'd like to give it a try, please PM me your rates.