updated get otp to support login and register, implemented protected apis and other improvements

added 4 endpoints to support merchant login

added regenerate otp endpoint, updated verify to validate either sms/email and made company id, email str code, mobile str code, status as optional attributes

added regenerate otp endpoint, updated verify to validate either sms/email and made company id, email str code, mobile str code, status as optional attributes

changing to merchant_name

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