As per the documentation, during the Opt-in via SMS flow, when the user replies YES to the welcome SMS, the subscriber_number and access_token will be sent in the body of the request to the Redirect URI set in the APP.
However, the body is an empty JSON Object.
http://www.globelabs.com.ph/docs/#getting-started-opt-in-via-sms
As per the documentation, during the Opt-in via SMS flow, when the user replies YES to the welcome SMS, the subscriber_number and access_token will be sent in the body of the request to the Redirect URI set in the APP.
However, the body is an empty JSON Object.
http://www.globelabs.com.ph/docs/#getting-started-opt-in-via-sms