5. What are the Bulk SMS API parameters?

Below is the explanation of all parameters :

1. Username (Mandatory) : The username of your account. To get username please register here
2. Password (Mandatory) : The password of your account.
3. Type (Mandatory) : Message type to indicate if the message is text, Unicode, flash etc
   t : Message to be sent. Must be URL encoded (GSM 3.38 Character encoding)
   tf : Flash (GSM 3.38 Character encoding)
   u : Unicode messages such as Chinese or Arabic
   uf: Unicode Flash messages such as Chinese or Arabic
4. To (Mandatory) : One or more phone numbers, separated by comma.
5. Source (Mandatory) : The sender name that should appear from.
   • Max Length 18 numeric.
   • Max Length 11 alphanumeric.
   Additional restrictions on this field may be enforced by the SMSC.
6. Message (Mandatory) : The body of the SMS message.
   – Sending Unicode messages such as Chinese or Arabic,needs to have the text encoded in UTF-16BE.
7. Scheduled (Optional) : To schedule the message to be sent sometime/date in the future. Time/Date format is: “yyyy-mm-dd hh:mm:ss” which must be URL encoded. The time must be in GMT .

For further information please check it here