do not waste your time to offer Woo commerce we are not interested ..
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Check the video
as you can see customer customise the product and add it to the cart to pay
we need you to create a Quote plugin for Opencart
customer will do exactly the same as you see on the video but there will be no price shown
they will be submitting this into the Quote Cart and once they submit ,
the request will be sent to suppliers to price it , it can be more than one suppliers
they will receive an email with unique link to price the requested quote (after they create an supplier account with their paypal details , if they dont have any)
once the suppliers entered their prices , customer will email and they will see prices entered for the quote and accept one and chose to pay and goto checkout ,.
we will need to use paypal split payment feature here , we will receive % of the sale and seller will receive his original price he quoted for .. so customer will see the price with our %commission included
you need to create all the styles and options you can see on the video so your work should include the quote plugin and the preparing the site with the necessary needed layout work and product data needed to create the quote , styles,images,questions,answers as you see on the video.