Merchant Integration Documentation(Backend Node JS Auth SDK)

---

> ## A. OTPLessAuth Dependency
>
> You can install the OTPLessAuth SDK using npm:

``bash
npm install otpless-node-js-auth-sdk
`

> ## B. OTPLessAuth class

The OTPLessAuth Node.js SDK is a powerful library that enables you to perform authentication using the OTPLess service. This SDK simplifies the integration of OTPLess authentication into your Node.js applications.

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---

> ### 1. Verify Auth Token

This method help to resolve token which is issued by OTPLess which return user detail
from that token also this method verify that token is valid, token should not expired and
issued by only otpless.com

##### Method Signature:

`javascript
const userDetail = await UserDetail.verifyToken(token, clientId, clientSecret);
`

#### Method Params:

| Params | Data type | Mandatory | Constraints | Remarks |
| ------------ | --------- | --------- | ----------- | ---------------------------------- |
| token | String | true | | token which you get from OTPLess |
| clientId | String | true | | Your OTPLess Client Id |
| clientSecret | String | true | | Your OTPLess Client Secret |

#### Return

Return:
Object Name: UserDetail

---

> ### 2. Decode IdToken

This method help to resolve idToken(JWT token) which is issued by OTPLess which return user detail
from that token also this method verify that token is valid, token should not expired and
issued by only otpless.com

##### Method Signature:

`javascript
const userDetail = await UserDetail.decodeIdToken(idToken, clientId, clientSecret)
`

#### Method Params:

| Params | Data type | Mandatory | Constraints | Remarks |
| ------------ | --------- | --------- | ----------- | ---------------------------------------------------------------------------- |
| idToken | String | true | | idToken which is JWT token which you get from OTPLess by exchange code API |
| clientId | String | true | | Your OTPLess Client Id |
| clientSecret | String | true | | Your OTPLess Client Secret |

#### Return

Return:
Object Name: UserDetail

---

> ### 3. Verify Code

This method help to resolve code which is return from OTPLess which will return user detail
from that code also this method verify that code is valid, code should not expired and
issued by only otpless.com

##### Method Signature:

`javascript
const userDetail = await UserDetail.verifyCode(code, clientId, clientSecret);
`

#### Method Params:

| Params | Data type | Mandatory | Constraints | Remarks |
| ------------ | --------- | --------- | ----------- | --------------------------------- |
| code | String | true | | code which you get from OTPLess |
| clientId | String | true | | Your OTPLess Client Id |
| clientSecret | String | true | | Your OTPLess Client Secret |

#### Return

Return:
Object Name: UserDetail

---

> ### 4. Magic Link

This method help to get magic link which is return from OTPLess which will return token
and request id from that mobile number or email id. Issued by only otpless.com

##### Method Signature:

`javascript
const magicLinkTokens = await UserDetail.magicLink(
mobile,
email,
redirectURI,
channel,
clientId,
clientSecret
);
`

#### Method Params:

| Params | Data type | Mandatory | Constraints | Remarks |
| ------------ | --------- | --------- | ----------- | ----------------------------------------------------------------- |
| mobile | String | false | | Input by your user. |
| email | String | false | | Input by your user. |
| redirectURI | String | true | | Your redirectURI. |
| channel | String | false | | WHATSAPP/SMS (if no channel given WHATSAPP is chosen as default) |
| clientId | String | true | | Your OTPLess Client Id |
| clientSecret | String | true | | Your OTPLess Client Secret |

#### Return

Return:
Object Name: magicLinkTokens

---

> ### 5. Send OTP

This method help to send OTP to your users and OTP issued by only otpless.com

##### Method Signature:

`javascript
const response = await UserDetail.sendOTP(phoneNumber, email, channel, hash, orderId, expiry, otpLength, clientId, clientSecret);
`

#### Method Params:

| Params | Data type | Mandatory | Constraints | Remarks |
| ------------ | --------- | --------- | ----------- | --------------------------------- |
| phoneNumber | String | true | | Mobile Number of your users |
| email | String | true | | Mail Id of your users |
| channel | String | false | | WHATSAPP, SMS |
| hash | String | true | | Your mobile application Hash |
| orderId | String | true | | Unique Order id |
| expiry | Int | false | | OTP expiry in sec |
| otpLength | String | false | | Values like 6 or 4 |
| clientId | String | true | | Your OTPLess Client Id |
| clientSecret | String | true | | Your OTPLess Client Secret |

#### Return

> success (boolean): This will be true in case of method successfully performed operation.

> errorMessage (String): The will be errorMessage in case of any error.

> orderId (String): This will be your Unique Order id.

> refId (String): The will be refId when OTP successfully send.


---

> ### 6. ReSend OTP

This method help to resend OTP to your users and OTP issued by only otpless.com

##### Method Signature:

`javascript
const response = await UserDetail.resendOTP(orderId, clientId, clientSecret);
`

#### Method Params:

| Params | Data type | Mandatory | Constraints | Remarks |
| ------------ | --------- | --------- | ----------- | --------------------------------------|
| orderId | String | true | | Unique Order id(same as send method) |
| clientId | String | true | | Your OTPLess Client Id |
| clientSecret | String | true | | Your OTPLess Client Secret |

#### Return

> success (boolean): This will be true in case of method successfully performed operation.

> errorMessage (String): The will be errorMessage in case of any error.

> orderId (String): This will be your Unique Order id.

> refId (String): The will be refId when OTP successfully send.


---

> ### 7. Verify OTP

This method help to Verify OTP to your users and OTP issued by only otpless.com

##### Method Signature:

`javascript
const response = await UserDetail.verifyOTP(email, phoneNumber, orderId, otp, clientId, clientSecret);
`

#### Method Params:

| Params | Data type | Mandatory | Constraints | Remarks |
| ------------ | --------- | --------- | ----------- | --------------------------------------|
| email | String | true | | Mail Id of your users |
| phoneNumber | String | true | | Mobile Number of your users |
| orderId | String | true | | Unique Order id |
| otp | String | true | | Enter otp here |
| clientId | String | true | | Your OTPLess Client Id |
| clientSecret | String | true | | Your OTPLess Client Secret |

#### Return

> isOTPVerified (boolean): This will be true in case of OTP verified.

> reason (String): The will be errorMessage in case of OTP doesn't verified.


---

> ### UserDetail Object Fields:
>
> success (boolean): This will be true in case of method successfully performed operation.

> authTime (Long, required): The time when authentication was completed.

> phoneNumber (String, required): The user's phone number.

> countryCode (String, required): The country code of user's phone number.

> nationalPhoneNumber (String, required): The user's phone number without country code.

> email (String, required): The user's email address.

> name (String, required): The user's full name.


> ### MagicLinkTokens Object Fields:
>
> success (boolean): This will be true in case of method successfully performed operation.

> requestIds (List, required): List of Token and Type of AUth.

> type (String, required): Auth type.

> value (String, required): Token value.


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success (boolean): This will be false. The method is failed to perform.

errorMessage (String): The message contains error information.


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`javascript
const { UserDetail } = require('otpless-node-js-auth-sdk');

const idToken = "..."; // Replace with your ID token
const clientId = "..."; // Replace with your client ID
const clientSecret = "..."; // Replace with your client secret

const userDetail = await UserDetail.decodeIdToken(
idToken,
clientId,
clientSecret
);
console.log("User Details:", userDetail);
``

This method allows you to decode and verify OTPLess tokens and retrieve user information for integration into your
node js application.