# Login

Postman Calls is built for use by **government officers** only. 

{% hint style="info" %}
Please note that Postman Calls is currently accessible for **whitelisted agencies only**. If your agency has a compelling use case related to scam prevention, you may [Contact Us](/help/contact-us.md) to share more details.
{% endhint %}

Postman Calls supports the following login methods:

1. **Singpass** 
   1. After logging in via Singpass, ensure that you select your desired profile, especially if you have multiple profiles.
   2. Each Singpass profile (linked to your work email address) corresponds to a separate Postman Calls 'account'.
      1. If you do not see a profile after Singpass Login, trying logging in using Email OTP
2. **Email OTP**
   1. This login method requires you to access your email inbox to retrieve the OTP during login.
   2. If you are logging in on mobile and do not have easy access to your email, you may wish to set up OTP forwarding to your mobile number beforehand using [this guide](https://docs.developer.tech.gov.sg/docs/postman-sgdp-guide/login-on-the-go).

Note:

* Login is based on your email address. Both methods sign you in to the same Postman Calls 'account'.
* Each login session lasts for 24 hours. After that, you’ll be required to log in again for security reasons.


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# Agent Instructions
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## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://postman-calls.guides.gov.sg/for-agency-users/getting-started/login.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.