I would like to create a form similar to [login to view URL]
Important features that I need:
1) User will copy URL from somewhere and paste in the description column
2) To key in quantity
3) to key in color
4) to key in the unit price
5) auto calculate the total price based on the quantity
6) Auto sum up function
7) Able to auto calculate handling fee (e.g. 20% of total price)
8) Auto calculate shipping fee
integrate with Paypal or Braintree if possible.
my current site is on Weebly.