I was involved in this back when there was money to be made in compounding.
If you want to stand a chance, you'd need LegitScript certification, 500,000 USD to burn on ad spend until you (might) become profitable, among other things.
The legal market is now not possible for new entrants.
What you're describing is the illegal market.
How this is done is the sales reps for Chinese manufacturers sell the compounds directly to end users via Telegram and Discord.
They get paid via bank transfer, usually into Wise accounts in︀ the names of totally unrelated businesses "ABC Digital Makerting" type of vibe.
Unless you are︁ a Chinese manufacturer, you won't be able to compete with them on price.
And you︂ could go to jail.
Pick another niche.