
Sending phone messages using the WhatsApp API is a game-changer for businesses and developers.
The WhatsApp API allows you to send messages to phone numbers without having to manually type in each number.
With the WhatsApp API, you can send messages to individual phone numbers or to groups, and even include media like images and videos.
You'll need to create a WhatsApp Business API account and verify your phone number to get started.
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Getting Started
To get started with using the WhatsApp API, you need to set up the API URL correctly.
Format the API URL as follows: https://api.whatsapp.com/send?phone=CountryCodePhoneNumber.
To send a message to a specific phone number, replace CountryCodePhoneNumber with the actual country code and phone number.
For example, to send a message to 601159543635, the API URL would be: https://api.whatsapp.com/send?phone=601159543635.
Sending Messages
Sending messages with the WhatsApp API is a straightforward process. You can send messages directly to any number using the WhatsApp API link.

To send a message, you'll need to know the target phone number in E164 format. This is a standard format for international phone numbers.
The WhatsApp API allows you to send media messages to a phone number, which is easy to do. You'll need to know the uploaded file ID, a 24-character hexadecimal code.
You can send messages to any phone number worldwide that has a WhatsApp account, without needing to add the number as a contact.
Here are the key steps to send a media message:
- Know the target phone number in E164 format
- Have the uploaded file ID (24 characters hexadecimal)
You can also live test sends media messages using the API directly from your browser. This is a great way to play, debug, and test the API in real-time.
If you're not interested in creating a direct link, you can still initiate a WhatsApp chat by messaging yourself and pasting the unsaved number into the chat.
Using WhatsApp API
Using WhatsApp API allows businesses to send pre-populated messages directly to a user's WhatsApp account, perfect for reaching out to customers, sharing updates, or conducting marketing campaigns.
The WhatsApp API link to send a message is a simple way to start a chat with anyone who has WhatsApp, using the format: https://api.whatsapp.com/send?phone=country_code+phone_number. This is useful for businesses looking to deliver quick, one-off messages or promotional updates without inputting their contact list with temporary entries.
To initiate chats instantly, you can embed a specific phone number within the API URL, for example: https://api.whatsapp.com/send?phone=919866543110. This endpoint is a simple yet powerful feature offered by WhatsApp, allowing businesses to automate frequent messages and personalize messaging for higher customer engagement.
Here are some benefits of using the WhatsApp API for your business:
- Increased operational efficiency by automating frequent messages.
- Personalized messaging leading to higher customer engagement.
- Easy integration with CRMs and other enterprise software tools.
Send Media Messages
You can send media messages to any phone number worldwide that has a WhatsApp account, there's no need to add a phone number as a contact in your mobile device agenda. Just know the target phone number in E164 format and the uploaded file ID.
To send a new media message via API, you simply need to know the target phone number and the uploaded file ID, which you can obtain from the uploaded files listing or from the list of uploaded files via the API.
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You can send messages to any phone number worldwide that has a WhatsApp account, there is no need to add a phone number as a contact in your mobile device agenda.
You can explore and try more API examples and get in one click ready-to-use code snippets available in 15+ different programming languages.
Here's a quick rundown of the media message format requirements:
note: encoding only supports H.264 video encoding and AAC audio encoding.16MBaudioaudio/aac, audio/mp4, audio/amr, audio/mpeg
audio/ogg; codecs = opus (note: basic audio/ogg is not supported, only audio/ogg is supported; codecs = opus)16MBdocument1. Any MIME-type type is supported when sending file messages.
2. When sending a template message, the file in the header only supports PDF format.100MBstickerimage/webpStatic stickers:100KB
Animated stickers: 500KB
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Using WhatsApp
You can message users directly without saving their contact data using WhatsApp's API.
The WhatsApp API link to send a message is a robust tool that enables you to start a chat with anyone who has WhatsApp, if you have the number.
To utilize the WhatsApp API link, follow this format: https://api.whatsapp.com/send?phone=country_code+phone_number.
You can paste the generated API or wa link into your browser's URL bar to check if it opens a WhatsApp chat with the predefined message.
The default text will populate in the message box as expected, and it works smoothly across both WhatsApp Web and mobile.
What is a WhatsApp API for Numbers?
The WhatsApp API for numbers is a powerful tool that allows you to send pre-populated messages directly to a user's WhatsApp account.
To use the WhatsApp API, you need to follow a specific format: https://api.whatsapp.com/send?phone=country_code+phone_number. This format is used to initiate a chat with a user's WhatsApp account.
The country code and phone number should be entered without spaces, dashes, or any other symbols. For example, if you want to message someone in India whose number is 9866543110, you will use: https://api.whatsapp.com/send?phone=919866543110.
This API is perfect for businesses to reach out to customers, share updates, or conduct marketing campaigns effortlessly. It can be used for sending quick replies regarding order updates, notifying customers about promotional discounts, and streamlining appointment confirmations or reminders.
Here are some examples of how businesses can use the WhatsApp API:
- Sending quick replies regarding order updates.
- Notifying customers about promotional discounts.
- Streamlining appointment confirmations or reminders.
Automated Responses
Automated responses can greatly enhance the user experience and increase efficiency for businesses using the WhatsApp API. This is achieved through the use of pre-approved templates that allow for instant replies to common inquiries.
By integrating an autoresponder, businesses can greet customers with a pre-set message when they first contact the WhatsApp number. This can be done using a simple autoresponder that dispatches a welcome message, order confirmation, or promotional offers.
Using the WhatsApp Business API, businesses can automate frequent messages, increasing operational efficiency. This can be achieved by integrating with CRMs and other enterprise software tools.
Automated responses can also lead to higher customer engagement through personalized messaging. By using pre-approved templates, businesses can tailor their responses to meet the specific needs of their customers.
Here are some examples of automated responses that can be used:
- Welcome message
- Order confirmation
- Promotional offers
For example, a business can use the following URL to send a pre-set message: https://api.whatsapp.com/send?phone=441234567890&text=Hi%20there!%20Thank%20you%20for%20reaching%20out.%20How%20can%20we%20assist%20you%20today?
Requirements and Troubleshooting
To ensure a smooth experience with WhatsApp API, you'll need to meet some basic requirements. You'll need to have a WhatsApp number already linked to the platform and online.
To send a message via API, you'll need the recipient's phone number with an international prefix in E164 format, like +12345678900. You can validate the phone number format here.
To test the API and troubleshoot any issues, you can use your web browser to simulate the user experience. This will help you check if messages are sent correctly and default messages populate as expected.
Getting the Credentials
To access the WhatsApp message API, you need a Phone number ID, which is different from your actual phone number. This ID is provided by default with a free test phone number.
You'll also need an access token to authenticate the API. This can be obtained by viewing the temporary access token from the API Setup menu on the left side.
The Phone number ID is what you'll use in the API, not your actual phone number.
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Requirements

To send a WhatsApp message via the Wassenger platform, you'll need to have a WhatsApp number already linked to the platform and online.
You'll also need to make sure the recipient's phone number is in the correct format, which is with an international prefix in E164 format. For example, a US phone number would be +12345678900. You can check if your phone number is in the correct format on the Wassenger website.
To send media messages via API, you'll need to meet the media message format requirements. Here are the supported formats for different types of media:
Remember to check the size limits for each media type to ensure your message doesn't get cut off.
Troubleshooting and Testing
Before fully integrating WhatsApp's API with your business workflow, it's a good idea to test links and automation on a small scale to ensure smooth operation.
You can use your web browser to test the API link and send a message to a number. Simply paste the generated API or WA link into your browser's URL bar to check if it opens a WhatsApp chat with the predefined message.
Check the default messages to ensure they populate as expected in the message box. This should work smoothly across both WhatsApp Web and mobile.
Benefits and Features
Using the WhatsApp API can revolutionize your business communication. By switching to an API-based model, you can automate frequent messages, increasing operational efficiency.
With this approach, you can send personalized messages that lead to higher customer engagement. This is a game-changer for businesses looking to build strong relationships with their customers.
Automating messages also frees up your team to focus on more important tasks. This can lead to increased productivity and better use of resources.
Here are some key benefits of using the WhatsApp API:
- Increased operational efficiency by automating frequent messages.
- Personalized messaging leading to higher customer engagement.
- Easy integration with CRMs and other enterprise software tools.
Frequently Asked Questions
How to make a WhatsApp API link?
To create a WhatsApp API link, start with "https://api.whatsapp.com/send?phone=" followed by your phone number in international format, without "+" or special characters. Simply copy and paste this format to generate your link.
How to send list message in WhatsApp API?
To send a list message, make a POST call to /messages with an interactive object set to type=list. Attach a message object with type=interactive to initiate the list message.
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