Questions in SSL & Best ideas 4 Recharge Cards

[ABo YaSSeR 4 EvER]

Hi,

 

Nowadays, I'm developing a website. You can in this site buy a (product), But HOW?

 

 

You can buy (Recharge cards) which have different types (100unit, 200, 500, ....)

 

 

Here is my problem.

 

1. When and Why and How can i use SSL?

2. My cards have (secret code), What shall i do? store all my cards SECRET codes in a Database? or use algorithm by crypts functions used in PHP, which has tow sides? by super secret key?

 

 

and have a nice day.

 

bye.