You have a task to modify the grand total on the checkout page with a negative price adjustment which depends on the shipping address postcode. What are two approaches to be used in this case?
Select all that apply, then click Submit answer.
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Create a new shopping cart price rule with a condition based on the shipping address postcode
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Create a JavaScript mixin for the Magento_Checkout/ js /view /summary/,subtotal, change total there and Magento will submit the modified total when placing an order
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Create a new total collector which adds a negative price adjustment based on the postcode
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Create an observer on the event sales_quote_collect_totals_after, get the quote object, check the postcode and set the modified grand total into it

