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Your interface with the stamps.com platform does not allow me to set my own postage rates. Many companies either charge no shipping for flat rate shipping. Your interface requires me to charge actual USPS shipping rates. For this reason, we just copy and paste the information from WordPress to Stamps.com.
You can disable the real-time rate feature of our plugin and use only to generate the shipping label from order admin page.
To configure Free or Flat rate shipping rates, you can use the Woocommerce default shipping options.