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From the information you’ve provided, the transaction data mismatch could be due to a number of reasons. First, check if all Google Analytics tracking codes on your website are functioning correctly. Next, verify that you’re comparing the same date ranges in your custom table and Google Analytics. Also, confirm that your ‘dimensions’ and ‘metrics’ are set properly. ‘Dimensions’ describe characteristics of your users, their sessions and actions, while ‘metrics’ are the quantitative measurements. Ensure that these correspond to the data you want to retrieve. Finally, check if any filters applied are causing data discrepancies. Remember, in Google Analytics, data sampling may occur in your reports depending on your date range and segmentation, which could potentially cause discrepancies. Consider using the Google Analytics API for large data sets to reduce sampling.
