Payment with crypto help

[Real_Steel]

I’m not familiar with cryptocurrency and had some questions with the payment currency. The source requested I buy bitcoin on coinbase send it to my perosnal wallet and from there send the bitcoin to them. Does the bitcoin retain its value throughout the whole process? What happens if I buy 100$ worth of bitcoin for a 90$ payment regarding transfer fees but the value drops and when they get it it’s only 80$. I’m confused about it. Should I be calculating how much it will drop and adding it to my initial purchase of bitcoin?

 

[302]

I always add atleast $5-10 extra to be safe. I know coming up a couple dollars short isn’t a big deal to us, but it adds up if your the source and guys keep doing it. Some will be pissed if your a dollar or 2 short. I’ve seen them not ship packs bc of it.
There will be transfer fees to.
I buy wherever and then send to my exodus. Then Exodus to vendor.
Exodus transfers are super cheap.