--- title: Authentication via API (Classic) description: To interact with MightyCall API, you must first authenticate your request by obtaining an authorization token. --- [Skip to content](https://support.mightycall.com/authentication-via-api-mc#main-content) [![Logo MightyCall 32x35](https://support.mightycall.com/hs-fs/hubfs/Logo%20MightyCall%2032x35.png?width=33&height=35&name=Logo%20MightyCall%2032x35.png)](https://support.mightycall.com/?hsLang=en) - [View status page](https://status.mightycall.com/) - [Submit ticket](https://share.hsforms.com/1soAJALfaT0uWAbdbOnNPWA8ozk) - [Visit our website](https://mightycall.com/) Open main navigation Close main navigation - [View status page](https://status.mightycall.com/) - [Submit ticket](https://share.hsforms.com/1soAJALfaT0uWAbdbOnNPWA8ozk) - [Visit our website](https://mightycall.com/) - How can we help you? - There are no suggestions because the search field is empty. 1. [MightyCall Help Center](https://support.mightycall.com/?hsLang=en) 2. [MightyCall Classic](https://support.mightycall.com/mightycall-classic?hsLang=en) 3. [Integrations](https://support.mightycall.com/mightycall-classic?hsLang=en#integrations) # Authentication via API (Classic) To interact with MightyCall API, you must first authenticate your request by obtaining an authorization token. Authentication is performed by sending a **POST** request to: `https://api.mightycall.com/v4/auth/token` This endpoint returns a bearer token, which is required to access all other API methods. The token is valid for **24 hours**, after which it must be refreshed or reissued. There are 2 ways Classic customers can authenticate via API: - By using their **API key + User key**, if they have a User key generated and toggled on in API integration; - By using their **API key + extension**, if they **don’t** have a User key generated and toggled on in API integration. So, for John here we will use the first method, and for Peter – the second one. 1. Create a new HTTPS request in your API client (we're using [Postman](https://www.postman.com) here).   ![2026-03-25_15-13](https://support.mightycall.com/hs-fs/hubfs/2026-03-25_15-13.png?width=670&height=390&name=2026-03-25_15-13.png) 2. Select a method for your API request (we'll need **POST** for this case) and enter the endpoint: [https://api.mightycall.com/v4/auth/token](https://api.mightycall.com/v4/auth/token) ![2025-10-28_13-42](https://support.mightycall.com/hs-fs/hubfs/2025-10-28_13-42.png?width=670&height=257&name=2025-10-28_13-42.png) 3. In the **Headers** tab, add the following information: | **Key** | **Value** | | --- | --- | | `x-api-key` | The API key that from your account's API Integration section | | `Content-Type` | `application/x-www-form-urlencoded` | ![2025-10-28_13-51](https://support.mightycall.com/hs-fs/hubfs/2025-10-28_13-51.png?width=670&height=208&name=2025-10-28_13-51.png) 4. In the **Body** tab select **x-www-form-urlencoded** and enter the following: | **Key** | **Value** | | --- | --- | | `grant_type` | `client_credentials` | | `client_id` | The API key that from your account's API section | | `client_secret` | Your User key or extension | John is using his **User key** as `client_secret`: ![2025-10-28_13-57](https://support.mightycall.com/hs-fs/hubfs/2025-10-28_13-57.png?width=670&height=234&name=2025-10-28_13-57.png) Peter is using his **extension** as `client_secret`: ![2025-10-28_14-19](https://support.mightycall.com/hs-fs/hubfs/2025-10-28_14-19.png?width=670&height=233&name=2025-10-28_14-19.png) 5. Click to **Send** the request. As a result, you should receive a **200 OK** response containing your **access\_token** (bearer token) **valid for 24 hours**, of which can be used for authorization in further API requests. ![2025-10-28_14-12](https://support.mightycall.com/hs-fs/hubfs/2025-10-28_14-12.png?width=670&height=304&name=2025-10-28_14-12.png) 6. You can use **refresh\_token** to include in the body of your new authentication API request: it will regenerate the bearer token and reset the 24 life cycle timer. In that case, you will need to change `grant_type` to `refresh_token` and remove other parameters from the **Body** tab: ![2025-10-28_18-29](https://support.mightycall.com/hs-fs/hubfs/2025-10-28_18-29.png?width=670&height=211&name=2025-10-28_18-29.png)   - [MightyCall Call Center](https://support.mightycall.com/mightycall-call-center?hsLang=en#main-content) - [Profile & Settings](https://support.mightycall.com/mightycall-call-center?hsLang=en#profile-settings) - [Subscription & Billing](https://support.mightycall.com/mightycall-call-center?hsLang=en#subscription-billing) - [Payment Methods](https://support.mightycall.com/mightycall-call-center?hsLang=en#payment-methods) - [Auto Dialer](https://support.mightycall.com/mightycall-call-center?hsLang=en#auto-dialer) - [Calling & Messaging](https://support.mightycall.com/mightycall-call-center?hsLang=en#calling-messaging) - [Messaging Compliance](https://support.mightycall.com/mightycall-call-center?hsLang=en#messaging-compliance) - [Call Flow Setup](https://support.mightycall.com/mightycall-call-center?hsLang=en#call-flow-setup) - [Numbers](https://support.mightycall.com/mightycall-call-center?hsLang=en#numbers) - [Team Management](https://support.mightycall.com/mightycall-call-center?hsLang=en#team-management) - [Workspaces](https://support.mightycall.com/mightycall-call-center?hsLang=en#workspaces) - [Reports](https://support.mightycall.com/mightycall-call-center?hsLang=en#reports) - [Mobile App](https://support.mightycall.com/mightycall-call-center?hsLang=en#mobile-app) - [Desktop App](https://support.mightycall.com/mightycall-call-center?hsLang=en#desktop-app) - [Integrations](https://support.mightycall.com/mightycall-call-center?hsLang=en#integrations) - [Deskphone Guides](https://support.mightycall.com/mightycall-call-center?hsLang=en#deskphone-guides) - [FAQs](https://support.mightycall.com/mightycall-call-center?hsLang=en#faqs) - [MightyCall Classic](https://support.mightycall.com/mightycall-classic?hsLang=en#main-content) - [Personal Settings](https://support.mightycall.com/mightycall-classic?hsLang=en#personal-settings) - [Subscription & Billing](https://support.mightycall.com/mightycall-classic?hsLang=en#subscription-billing) - [Calling & Messaging](https://support.mightycall.com/mightycall-classic?hsLang=en#calling-messaging) - [Messaging Compliance](https://support.mightycall.com/mightycall-classic?hsLang=en#messaging-compliance) - [Call Flow](https://support.mightycall.com/mightycall-classic?hsLang=en#call-flow) - [Team & Roles](https://support.mightycall.com/mightycall-classic?hsLang=en#team-roles) - [Business Numbers](https://support.mightycall.com/mightycall-classic?hsLang=en#business-numbers) - [Mobile App](https://support.mightycall.com/mightycall-classic?hsLang=en#mobile-app) - [Integrations](https://support.mightycall.com/mightycall-classic?hsLang=en#integrations) - [Deskphone Guides](https://support.mightycall.com/mightycall-classic?hsLang=en#deskphone-guides) - [FAQs](https://support.mightycall.com/mightycall-classic?hsLang=en#faqs) [mailto:support@mightycall.com](mailto:support@mightycall.com) Copyright © 2025, MightyCall