Is this a scam? I just had an email like this

[ghaitzaaqshalm]

5 hours ago, I have an inbox from user from Poland. She tell me that she likes my 3D design. There's an email that there's an order from my gigs. She have transfer me and I have to fill my bank account in submission link. But, when I fill my bank account, they tell me that I should have 300 USD in my bank account to process the funds. Is this a scam?

[filipdevaere]

This is a scam. 

Do not continue. 

Report the buyer and block him. 

[donnovan86]

33 minutes ago, ghaitzaaqshalm said:

I have an inbox from user from Poland.

Clearly not from Fiverr. 

33 minutes ago, ghaitzaaqshalm said:

But, when I fill my bank account, they tell me that I should have 300 USD in my bank account to process the funds

No, they want you to have as much money as possible so they can withdraw the entire amount. 

If you already shared the info that person requested, block your bank account or request a chargeback.