Install WooCommerce first if you sell products. Then install and activate the WooCommerce Square plugin. Go to WooCommerce → Settings → Payments and enable Square. Click Manage and connect your Square account. Select your Square location, confirm currency, and save settings. Enable test mode first, place a test order, then switch to live mode. If you do not use WooCommerce, create a Square Payment Link and add it as a button on your WordPress page.
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