yea. lets say you use hyper cause he reached out to you. youll pick your compounds, these are just numbers idk his prices
test c x4 30$
primo e x1 100$
your total to him will be 130$. i get 140 to my cashapp then switch it to bitcoin at 140, because they are going to charge you a fee and we dont want to fuck our sources out of money. so i alway over pay a little. then hyper will send you the email after you told him what you want with his wallet info, then youll copy it, paste it into your "send bitcoin" and then hyper will send you an email saying he received the money and then whenever he ships it youll get a tracking number USUALLY.
might not be step by step but you should get close. good luck