eCommerce mobile website developer to fix some issues

We have a mobile version of existing eCommerce site which is in OSCcommerce platform. Here same database is shared by Desktop Website and mobile version website. We've just discovered a problem with the mobile site in regards to credit card details not being recorded when a customer uses the mobile site. Credit card details are still coming through correctly from the main site though. Also, we are getting the certificate error when attempting to checkout. On android we get a security warning and on iPhone it simply doesn't advance. I am looking for an expert mobile website developer. Desktop version: [login to view URL] Mobile version: [login to view URL] **Please apply if you are an expert mobile version of website developer and confident to fix the issues.