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Warnings object

Understand the warnings object.
A warning is triggered when something unexpected occurs that is not severe enough to complete the request and implies that the request did not do what you intended. The warning will appear in the response. You can decide whether to continue with the checkout. For example, a shopper uses a product-restricted line item coupon code when the product is not in a cart or a shipping offer coupon code when the shipping method is unavailable for the cart or country.
A warnings object should contain the following details: the code and description associated with the warning in a 200 OK response.
The Shopper APIs use the following format for warnings:
"Warnings": [
"Code": "couponcode_not_eligible",
"description": "The relevant discount triggered by {coupon code} will be applied to the cart once it meets the offer criteria."