First log into your Message Bird Dashboard
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If you have not already created an API key, create one.
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Now reload the page to see the new API key listed.
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You can input these values into Spotipo by logging in the dashboard and go to Settings-> SMS Gateway.
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Select MessageBird as SMS gateway and enter the Sender Name and API key and save the configuration.
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Test the configuration by Clicking on Test and enter a phone number to send a test SMS.