How do i get Credit and what are the differences between member groups?

Are there other way to purchase credit? cos the payment method available to me are not working.
 
I know having rules is good, but there are a lot of rules here for credits, exaggerated.
 
I don't quite understand how it works, could you help me? I have 1 extension that I purchased and I would like to share it and get credits
 

Member rezwan was joined discussion #728 via short message

Tnx
 
Top