Create cart item addons
documentedAdd addons to a cart item.
POST /api/v2/cart/{cart_id}/items/{item_id}/addonsCartno implementation yet0 runsInput
cart_id
Cart ID
Cart ID (16 chars)
item_id
Cart Item ID
Cart Item ID (8 chars)
addon_id
Addon ID
Addon ID
quantity
Addon Quantity
Quantity
Calls whmcs as you (your API key is your account); keychains.dev holds the credentials.