I have a $15 dollar credit on my Fiverr account. When I ordered earlier today my credit was not automatically applied to my purchase.
I’m placing another order but I want to apply the credit Fiverr owes me. Can anyone help me figure this out?
I assume the order you made today was over $15? Ask the seller to give you 2 custom quotes. One worth $15 (so that your Fiverr credit can be used), and another quote for the remaining amount 
When you order, it should give you an option of where you want the funds to come from. you could always try removing the credit/debit card from your account
I think it does it automatically if you order a gig less than or equal to the amount of the gig you are buying. At least it did that for me once.