The iPad is the world's most commonly used mobile device for payments, with users spending on average 20 percent more per purchase than on other mobile devices, according to a research conducted by Adyen, a provider of global internet payment and e-commerce services. Already 3.6 percent of all global payments are now completed using iPad devices, compared with 3 percent on iPhones and 1.5 percent on Android devices, with use of iPad and Android devices for payments experiencing the fastest growth.

The research also showed that the worldwide share of all mobile transactions on Ayden's global Internet and e-commerce services have more than doubled over the past eight months from 3.6 percent in late 2011, to 8.4 percent in June 2012.

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 Mobile doesn't just cover mobile phones, tablets are also vital. If you want more purchases on your site include both types.