Prestashop discount to increase total cart price - php

It's sounds a kind weird but I need to use a Prestashop 1.7 discount based on transportation id = 1 to increase 20% over cart's total.
I don't know where the function is and where to place...

You need to find module. For example Cash on Delivery with fee.

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Magento 2 table rates- minimal amount necessary?

I use the Magento 2 table rates as calculation system for shipping costs.
For low weight products the shipping is for free. Or in the table rates file noted as € 0,00.
But it seems not to work for customer view in shopping cart. If a customer gets as high as € 0,00 for shipping costs the Magento system shows "Shipping: Not calculated yet".
So I think the Magento table rates system cannot deal with total shipping costs of € 0,00.
Is this indeed the situation or can I do something to get the € 0,00 amount accepted in the Magento store cart?
Thank you for reading and thinking it over!

How to make cart & checkout page calculation in opencart

Actually, i'm working on opencart 2.3, if now checkout page calculation in opencart:
Sub-Total₹ 1,520.00
India Shipping₹ 180.00
Discount (-07%)₹ -119.00
Total₹ 1,581.00
it s taking discount in shipping amount also i don't want discount shipping amount, i want calculation like this please help.
Sub-Total₹ 1,520.00
Discount (-07%)₹ -106.40
India Shipping₹ 180.00
Total₹ 1,593.60
you should change in admin>extensions>extensions>Order totals... sort order for the shipping. Move it down by changing sort order number higher than your discount voucher.

How to increase shipping cost depending on quantity of order?

Pretty much I want to increase the shipping cost depending on the number of items in order... e.g. by default shipping cost is 10$ but when number items goes beyond 20 it will add 3$ to shipping cost so it would be 13$
I tried changing codes but it's complicated somehow
I had to find all places that include shipping tax like in 1-blockcart module, 2-one page checkout, 3-payment, 4-inserting to database... And then change some codes. And it's a lot of work and hard
Prestashop includes a shipping range functionality. You can define shipping cost depending of the total weight of your products.
If you want a simple implementation, you can define all your products weight to 1Kg and add shipping cost ranges like those:
0kg => 20kg : 10$
20kg => 40kg : 13$
40kg => 99999kg : 15$

Magento Negative product price

I need to find a way to create Negative product prices in Magento.
We use Magento both as Online shop and POS and in POS we sometimes need
to give a certain discount that simply can't be accomplished with coupons or shopping cart rules.
I did some googling but nothing turned out. Does anybody know how I could create this?
Example:
1 x Apple iPhone 6 - € 699,99
1 x Discount with subscription from provider X - € -100
Total : € 599,99
Thanks in advance!
Why can't you use coupons?
Another possible way to go with is a configureable product option. You need to setup this for each product, however. An option can have a negative price, in your case -100€. You can include an description as text on invoices, but it won't show you "599.99-100.00 = 499.99" but just "499.99" as row total price.

Ubercart - Product discount based on total number of all products in cart

I'm using Ubercart in Drupal for a simple web store. I'm having trouble calculating a product discount based on the total number of all products in the cart. For example, I'm easily able to define discounts for if a user buys more than one of the same product, using the uc_custom_price module. But I want to give the discount if they buy more than one of any product. If they buy item 1 for 10 dollars and then add item 2 for 10 dollars, then I want both items to now cost 8 dollars.
Hopefully this makes sense. I searched the forums and googled for a couple of hours, but I just can't get this to work correctly. Thanks for your help.
Check Rules + Ubercart module. Or write custom code on order creation

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