Create a new entry code for a device with keypad

Hi dear,
I have one device (named = main_entrance) with a keypad.
How can I create a new entry code for this device over the API ?
Also I want to search for the existence of an entry code and to delete an entry code.

Unfortunately I have not found anything in https://developer.nuki.io/ or in https://api.nuki.io/
Can you help me please ?
BR

sorry my mistake, here is all examples
Web API Example: Manage PIN-Codes for your Nuki Keypad