With abledating when we deside to be a member(silver giold , etc)
you need to paid by credit card,etc
Evrything work just fine.

I want to add option to get a membership by a PROM_CODE

Your will have to do:

Add a section in admin panel for add code.
By entering the code, the membership is set automativly.
Close to same then the credit card paiement already in place.
With this follow cretera:

Code:
membership type
time of membership(day)
number of use of code before get deleted(1 to 00) 0 mean unlimited

I need to be able to add, remove or modify a code.

thanks