If it's just for when the door is open then you need a set up like the marker/puddle lights kit. They work only when the door is open and that is what i fitted in the pictures. But you need a little knowledge and a decent multimeter with wire probes to find the correct wires to make it work.
@saxoboy is the man I got my kit from so maybe he could help. I can try and find the pictures I took when I did mine. Is yours a T6.1 as I think it's a different wiring configuration in a T6