Hello guys,
I'm wondering how the cc/dumps stores have some sorta payment gateway that let them accept cryptocurrency and that 'add fund' option, is that something related to blockchain websites? can someone explain, thank you.

All they need to do is generate btc addresses linked to their wallet. There are websites that offer this as a processor but it wouldn't be too hard for owners to write their own to do this

Thanks for your input, but I don't understand how the random address is generated for each user and the wallet system for the user works, I'm sorry if I'm being too noob but I'm really helpless to find out the way.
And you said some websites offer this as a processor, can you name few?
Thank you
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The block chain generates addresses so the seller needs software or a processor to communicate with the block chain to produce new addresses for each customer. As for gates ways .. google it will bring up tonnes. Stripe used to process btc payments but have now stopped. Tonnes of other though still do

Thank you @epicmarket