What is the minimum transfer for BitPay?

Could you please explain to me what the minimum transfer amount is for BitPay? I'm interested in using their services but I'm not sure if the minimum limit would suit my needs. Is there a specific dollar amount or a certain amount of cryptocurrency that I need to transfer in order to use BitPay? And if so, does this minimum transfer amount apply to all types of transactions or are there any exceptions? Thank you in advance for your help.