calculating shiping cost by grouping products into suppliers

[pat.motsumi]

I would like to  achieve the following for shipping estimates

1. Get all products in the cart and populate in another array

e.g 

$customerequest =  '{
  "items": [
    {
      "name": "Shoes",
      "description": "yello",
      "imageUrl": "string",
      "isFragile": false,
      "length": 2,
      "width": 2,
      "height": 2,
      "mass": 2,
      "quantity": 1,
      "locationFrom": {
        "locationName": "Gaborone",
        "lat": -24.6523693,
        "lng": 25.9036909
      }
    }
  ],
  "customer": {
    "firstName": "Firstnamr",
    "lastName": "lastName",
    "phoneNumber": "+675190199983",
    "email": "[email protected]"
  },
  "reference": "7754874"
}';

2. Get product location in terms of coordinates to an array

e.g "locationFrom": {
        "locationName": "Gaborone",
        "lat": -24.6523693,
        "lng": 25.9036909
      }

3. Enforce suppliers or sellers to input their shop coordinates 

4. shipping estimate for multiple products from different suppliers