Hello Francisco,
Nice to see your requirement for chrome add-on. I understood underlying tasks and implementation of Google API. It will take 10-12 effort to accomplish this task.
Technically I am competent in 3rd Party Gateway/App/Plugin/Script Integration, PHP (v5.5 & 5.6), CodeIgniter, WordPress, Magento, Joomla, MySQL, HTML/HTML5, CSS/CSS3, Ajax, jQuery, Bootstrap v3, JavaScript etc.
Please could you initiate chat to discuss more queries regarding API?
I am readily available to commence this project.
Thanks & Regards,
Brijesh N, Web Expert