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After registering to an SMS service, you receive a link containing login details.
Link example:
https://smsService/servicename/?username=User1&password=password1@vaS&to=+97254555555target&text=text__body
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Once you make a decision Please share with us the protocol documentation so we will integrate based on the message structure and message status codes. And share Share with us your SMS service account credentials.
There might be some commercial charges so please discuss with your account executive before starting the process.