What will be the best way to implement a add-to-cart directly into the designer ?
Like this example (sorry it's in french) : http://jaimemontshirt.com/p45-t-shirt-150gr-homme
Any interesting resources ? solutions ? ideas ?
I'm using FPD for wordpress.
This can only be done in a customisation. Currently we are not available for any custom job. But we have a partnership with an external company that offers WordPress experts from just $29 per hour. I am sure they can help you with your concern.