How to automatically add the selected gifts to the basket?

Question

1C-Bitrix

Hello, how can I implement this functionality?
1. From the amount - I choose the amount in the condition, let's say 1500, then receive a gift such and such.
Accordingly, the conditions are not limited. Any amount. Buy from 1500 get this, buy for 3000 get this, buy for 5000 get the third.
2. From the product - I choose a product and another product that I specify is automatically added to it as a gift. Suppose a person buys for 10,000, and the product indicated by me with a zeroed amount is automatically added to it.
3. If you specify several gifts for the amount or position, gifts appeared in the basket, a person could choose one of them.

Answer 1

Add a gift
Get a cart
Sale\Order::load($orderId)->getBasket();