Find cashcard code?

I just bought a GTAV Cashcard from Ps4 in the Playstation Store. I then received an email with an order confirmation.

However, I don't find any code anywhere that I could redeem anywhere.

Will that happen by itself at some point? How do I proceed?

Thanks in advance.

Ps: can I find THIS purchase somewhere in the PS Store? The only indication of the purchase was the email.

The money from the cash card is automatically transferred to your Mazebank account