[Using CC0 assets in work for a client on fiverr - allowed and fully legal?]

Let's assume that I am doing a 3D project for a client, among my models and assets I use a texture / image from the Internet marked as CC-0 license:

"The Creative Commons CC0 license gives you near limitless freedom to use the materials, models and other assets: You can copy, modify, distribute and perform the work, even for commercial purposes, all without asking permission."

https://creativecommons.org/publicdomain/zero/1.0/

I provide the client with a source file containing said texture. Of course it is only a small part of the overall project.

Is it okay in terms of a legal / licensing aspect? 

[CHANGE MY WITHDRAWAL METHOD - I AM GETTING TIRED OF THIS PLATFORM]

I ordered a Payoneer - Fiverr Revenue Card, verified my account and activated the card. It's been days now and I still can't use it.

I want to withdraw funds from Fiverr to my Payoneer card.

I click:  on the earnings site. 

Next thing I see is:

 

I confirm via SMS and open an email that appears right after:

After opening the link from the email I see this:

If I click anything I see:

TALKED WITH "SUPPORT" THEY SENT ME TO PAYONEEER, TALKED WITH PAYONEER AND THEY'VE SENT ME BACK TO FIVERR... FIX IT.