Please capitalize where necessary: the checkout process requires you to provide your billing and shipping details as well as choose your payment option.
A: The checkout process requires you to provide your billing and shipping details as well as choose your payment option.

Please capitalize where necessary: confidential commodities under section 7
A: Confidential commodities under Section 7

Please capitalize where necessary: most popular properties in yekaterinburg
A: Most popular properties in Yekaterinburg

Please capitalize where necessary: games also include all kinds of games associated somehow with the underwater world and mermaids.
A:
Games also include all kinds of games associated somehow with the underwater world and mermaids.