I'm looking at using HSBC CPI and using PHP. How much might it cost to have someone write the PHP code, for say the purchase of one item? I may want also want to set it up for 4 different items. When I say items, I don't mean a shopping cart system, I mean for example just an individual product being purchased from one page.
Also how long might this take an experienced coder?
it depends, an experienced coder might ask from 200 - 500, whereas a beginer can charge below 150, someone who has already done it will be able to complete this work in 4 hours, while others may take time from 2-7 days (depending on there understanding and availability of sampel codes)