WooCommerce Royal Mail
Another very common primary solution in the UK is Royal Mail. This plugin provides your shop with delivery rates without the need for any API. In order to use this plugin, as the base country, you need to set GBP as well as United Kindom money. Although this plugin does not provide your shop with many features, there is no public Royal Mail API available, but if you use Royal Mail, this plugin will certainly help you a ton.
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