Shopping cart implementation for Classified Ads

Hi,

We are trying to understand what is the best Shopping solution that we could use to implement Classfied Ads where users will be charged for certain number of Ads that they can post in a month. Our important requirements for this shopping card implementation are

1) Ofcourse secure transactions

2) Scalable

3) Affordable

I really appreciate if you can share any best solution for our use case.

Best Regards,

~Ram

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