API Reference

Send OTP

post
https://www.fast2sms.com/dev/otp/send

Send an OTP to a mobile number using a predefined OTP template. You can customize the OTP length, expiry, and provide values for variables in your DLT template.

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This endpoint allows you to send an OTP to a mobile number. You can either provide your own OTP or let Fast2SMS generate one for you.

Body Params
string
required
^[0-9]{10}$

10-digit Indian mobile number.

string
required

Your unique OTP Template ID.

integer
1 to 10080
Defaults to 15

OTP expiry time in minutes (Min: 1, Max: 10080, Default: 15).

integer
4 to 10
Defaults to 6

OTP length (Min: 4, Max: 10, Default: 6).

string

Optional: Pass your own OTP value if you don't want Fast2SMS to generate otp. (max 10)

string

Values of {#var#} variables used in the DLT template (if any), separated by pipe (|).

string

User Defined Field 1 – Optional custom value passed via API and returned in the webhook for your internal reference or tracking.

string

User Defined Field 2 – Optional custom value passed via API and returned in the webhook for your internal reference or tracking.

string

User Defined Field 3 – Optional custom value passed via API and returned in the webhook for your internal reference or tracking.

Headers
string
required
Defaults to YOUR_API_KEY

Provide "YOUR_API_KEY".

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Updated 2 months ago

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Updated 2 months ago

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