[IMP] - make possible to inherit the method _add_order_extra_line (done for prestashoperpconnect in a first place to be able to add or not the tax on delivery lines)
[IMP] - make possible to inherit the method _add_order_extra_line (done for prestashoperpconnect in a first place to be able to add or not the tax on delivery lines)


yvaucher/connector-ecommerce,Antiun/connector-ecommerce,factorlibre/connector-ecommerce,Endika/connector-ecommerce,brain-tec/connector-ecommerce