One of the most effective SEO strategy is submitting unique articles to high quality article directories and embedding a couple of links in it, this helps in getting those links indexed in Google and attain high ranking. Here are some of the sample unique articles we have created and the directories we have submitted it to.

http://ezinearticles.com/?How-Does-Online-Credit-Card-Processing-Work?&id=5379480

http://goarticles.com/article/How-Merchant-Accounts-help-your-Online-Business/3680107

http://www.ideamarketers.com/?articleid=1665211&CFID=70607478&CFTOKEN=50374702

http://www.articlesbase.com/management-articles/who-should-apply-for-a-merchant-account-and-why-3701556.html

You can do the same thing too, its not hard and its free. Good luck!