blind spot assist mercedes glc facelit c253

Good afternoon. I am trying to install the blind spot monitoring system in my Mercedes GLC C253 facelift from November 2019. It already has the MBUX NTG 6.0 system (Win WDC2533161F692205). I have already bought all the necessary parts: the speed cameras, their mounts, the bumper wiring, the mirrors with the red triangle warning LED, and the door modules, since the ones I have are not compatible with this installation. I need help with the coding. I have Monaco DTS 8.16 with the OpenPort 2.0 interface and Xentry version 2025. I will not install it until I have the coding. By the way, one question: can the speed cameras and door modules, for example from eBay, be used, or do they have to be new? Thank you very much.