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Open Settings → Taxes to decide whether the store charges tax. No, don’t charge tax disables tax calculation and receipt tax lines. Yes, charge tax at checkout enables a tax breakdown. Review the current options shown for your store before saving; the tax treatment and available rates can depend on your configuration.

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Set the rate and exceptions

Choose the default rate or enter a custom rate. The dashboard applies it to taxable products unless a category-specific override exists. Select Add category rate to give a category a different rate or mark it tax exempt. Edit an existing category override from the list. Check which categories your products belong to before relying on the exception.

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Choose transaction-fee handling

Open Settings → Transaction fee to review how Payam’s transaction fee is applied. The page provides treatment choices and a checkout preview showing subtotal, discount, fee, any international-card surcharge, and total. Select the treatment that matches your store policy and complete any activation step shown. Reopen the checkout preview after saving, then use a test order to confirm what the shopper sees. Changing tax or fee settings affects monetary totals. Review a representative product, a discounted order, and a delivery order in checkout before taking live orders under the new setup.