Please keep answers on-topic, meaning that they're limited to why the question was closed as off-topic, since that is the issue at hand, and until that is addressed, no other reasons relate to why it was closed.
closed as not constructive by danlefree Jul 16 '12 at 10:10
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I can't say why the question was closed as "off topic", flags don't appear in the timelines as far as I can tell, and beyond the mod there were no other votes to close.
Going by RandomBen's comment, "Not Constructive" would have been a better close option:
This question is not a good fit to our Q&A format. We expect answers to generally involve facts, references, or specific expertise; this question will likely solicit opinion, debate, arguments, polling, or extended discussion.
There are similar questions already on here, and I'd have thought that this was a good topic - albeit the question could do with a little tidying (grammar in the title, add the ecommerce and/or payment-gateway to it)
- What payment gateways fit my website?
- Accepting money on a website as payment: when do I move past PayPal?
To be honest, the first one (about options) is probably closest to your request - the answer certainly gives you some things to consider - and so the question might better have been closed as a duplicate of that.