The idea is to add to api a new method which allow to append new values to existing Array CUF. to simplify creating simple cart with orders in DM.
e.g. Show card item with 5 products. Under each is custom button which saves value to Array and if customer clicked first and third item button, i have values [1,3] in saved array.
Next step is to allow reading Array to get value from specified position in array. eg.
Array [0,1,3,4,58,4] and if i want only value for item in position 2 it shoud return 3 etc.