Its4sms provides SMS messaging services including two-way SMS, shortcodes, email-to-SMS, and bulk SMS.
The Its4sms API provides a variety of SMS-related functions, including sending and receiving messages, sending time-delayed messages, checking delivery status of messages, and checking your account balance.
This API operates over HTTP, and requires a Username and Password for access. Username/Password can be obtained by creating an account on their site, though credits must be purchased before any methods relating to sending messages can be used.
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