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Can I use the same Merchant API key for multiple e-commerce websites?

You should only use your API key for the website that you provided during your onboarding process – this is monitored for every transaction. Repeated transactions from different websites could lead to the deactivation of your Merchant account.

You can, however, use your API key with another website ONLY IF the website lists the same items for sale as the other one, and your nature of business does not change at all. If you need to accept payments for different products through more than one website, please create a Revolut Business account for each one.