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https://checkout.mysite.com/checkout?products=87.45:1
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The campaignProductId is found within your offers/upsells list within your campaign.  The variantId is found within the base product that the offer/upsell was built with. You can determine the base productId by editing the offer/upsell configuration, then use the Product Search page to edit the base product and view the list of variants, with their associated Ids.  |
Note: If you’re using Woocommerce see this guide here.
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