How do resolve the error OTP not found and placeholder not found in the message?

Use the placeholder for OTP in the message content as ##OTP## or if you are passing the value of OTP from your end then you need to put the same in the message as well.

In the Get method, kindly encode the ##OTP## and then pass the same in API, and in the Post method, you can directly pass ##OTP##.

Sample Get Method: http://control.msg91.com/api/sendotp.php?sender=MSGIND&authkey=Yourauthkey&message=your verification code is %23%23OTP%23%23&mobile=919999999999&DLT_TE_ID=111111111111111111

Sample OTP API with OTP value: http://control.msg91.com/api/sendotp.php?authkey=authkey&mobiles=919999999999&sender=SENDER&otp=1234&DLT_TE_ID=1111111111111111111&message=1123 is your otp

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