Login to your FireText account and get your API key.
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Its available in Settings -> API

Find out the sender ID. Easiest way is to look in “**Send a Message**” tab
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Spotipo configuration

You can input these values into Spotipo by logging in the dashboard, and go to Settings-> SMS Gateway.
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Select Firetext as SMS gateway and enter the Sender ID and API Key and save the configuration.

Optionally, this can be tested by entering a phone number and then send a Test SMS.