Authorize.net Direct Post Method (DPM) for opencart

[login to view URL] has different api's, i'm interested in "DPM" [login to view URL] however the extension is not in the backend of my opencart payment settings and i've searched google and have not been able to find an extension. i don't know if i'm about to use the proper terminology or not but what i need is someone to integrate [login to view URL]'s DPM api into my opencart and customize my checkout page to make it look the way i want. I would also like a few minor details changed like certain logos replaced paypal for authorize net on home page/footer, login /register page fields /buttons moved around to make it all fit on the page without scrolling, add link on home page above "about us" labeled "Handbags" and have it direct my customers to my handbags section, and also redirect my logo/link above it to send customers to my homepage instead of the handbags section, and lastly i want all my buttons changed I will supply you with the button I would like to use.