How to add a cookie banner to a website: install it, verify it and test the reject choice
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How to add a cookie banner to a website: choose regions, install the code before other scripts, verify it, test the reject choice and check the signals.
Bottom line: To add a cookie banner, pick a consent tool, choose the regions you serve, build the banner, paste its code into your site header before other scripts, verify it, then test the reject choice. On WordPress and Shopify the vendor's help center gives exact steps. Ask a lawyer which rules apply to your visitors.