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The issue appears to be with how you are passing in event parameters in your ‘purchase’ event. In GA4, the correct parameters for the ‘purchase’ event aren’t ‘event_action’ and ‘event_category’, but ‘transaction_id’, ‘affiliation’, ‘value’, ‘tax’, ‘shipping’, ‘items’, and ‘coupon’. Additionally, the item array arguments should contain ‘item_id’, ‘item_name’, ‘affiliation’, ‘item_brand’, ‘item_category’, ‘item_variant’, ‘item_list_name’, ‘item_list_id’, ‘index’, ‘quantity’, ‘price’, ‘item_coupon_code’, ‘discount’, ‘currency’. Please refer to the GA4 documentation for specifics on sending purchase events. So, you should revise your gtag script accordingly, replace the placeholders with actual values and map your product data properly into the ‘items’ array.
