How to avoid duplicate transactions when the business uses third-party software.
Please follow the below steps:
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Go to the Kangaroo Business Portal
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Go to the Settings section
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Go to Apps & Integrations
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Go to the Lightspeed Retail section for Settings

-Scroll and enable the following "Import and reward eCom sales" in the Earning and Rewarding section. 
-Click Save
N.B: Don't forget to disable the Reward Shopify purchases in the Ecom section for the Apps & Integrations after enabling the Import and reward eCom sales