Adding an SMS gateway to Spotipo is needed if you intend to use Phone number validation or sending payment account details via SMS.
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Login to the Spotipo dashboard and go to Settings -> SMS Settings.
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Select the SMS gateway you like to use and configure the credentials.
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Remember to enable the settings and save it by pressing Save.

Optionally test the SMS functionality by sending a Test SMS (enter a telephone number in the field shown) and click TEST.