Required Database,API freelancer for HTML Developer to make changes job

We are looking for someone to help us out with a custom html calculator.

The changes we want to make:
Minor changes:

• Change product photo's
  
• Currently waiting on final designs, but all 4 photo's have to be changed.
  
• Change product titles
  
• Canvas 180 -> Zitbank Canvas
  
• Matrix 005 ML -> Zitbank Matrix
  
• Oslo -> Picknicktafel Oslo
  
• Agora -> Plantenbak Madrid
  
• Switch position plus and minus sign ( plus on the right side is more natural)
  
• Remove Prices from the "request your pricing offer" page
  
• Make the message field non required

Bugs:
We currently have some issues setting up cross domain tracking inside this embedded iframe. Do you have any experience with Google Tag Manager and cross domain tracking, or a development idea on how we can capture the original traffic source/medium when people go from waste wonders to the embedded iframe.

Skills & Expertise Required

Database API