Get a Test API key for our Sandbox Environment and try out our WhatsApp Business API.


What you can do in the Sandbox

  • You can use the Test API-KEY to send text messages and text templates to your own phone number.
  • An unlimited amount of messages can be sent with the sandbox.
  • Your phone number acts like a user and can send and receive messages.
  • The number can be a landline number, as long it is able to use WhatsApp.
  • You can switch the endpoint at any time. If you don’t have one yet you can use a free service like RequestBin to set up an endpoint.
  • Each Sandbox API Key is linked to one phone number and you can only send test messages to that phone number. If you wish to test messages with more than 1 number then it is advised to set up a test WhatsApp Business Account (Staging WABA) to use instead of the Sandbox.

What you can’t do with the Sandbox

  • The Sandbox is a test environment only. You will not be able to use it to send messages to your clients. You can only send messages to your own phone number.
  • Media download and upload are not supported yet (coming soon).
  • Templates messages can be sent a maximum of 10 times. You can choose between 2 predefined templates.
  • Messages and Templates can be sent only to your own phone number.
  • We will only forward and trigger an API when your given number is involved.
  • We do not yet provide response information when you use the WhatsApp API.
  • You only have access to the WhatsApp API.
  • Our Sandbox is available to test via the API, but any automated tests would have to be configured from your end.


1. Get a Test API Key

To get a test API-KEY you can either

Send a WhatsApp message from your phone to the phone number 4930609859535 with the content START

or You can use this link:

As a response, you will receive your TestAPI-KEY.This API-KEYis associated with your phone WhatsApp number. Now you are able to use the 360dialog WhatsApp API. You can set your own Webhook or send an unlimited number of messages and limited (10) templates.


2. Set your Sandbox Webhook URL

Ready to Get Started?

Enjoy the experience, C2SMS is the right choice for you and your business!


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What is bulk messaging? How does bulk SMS help your business?

Bulk SMS also referred as bulk messaging simply means sending out a large number of SMS for delivery to targeted mobile numbers. A good bulk SMS Service provider will make the process of sending out these many messages easy with the click of a button. Bulk SMS helps businesses and enterprises to send out important information to their customers. Bulk messaging is widely used for transactions, promotions and mobile marketing.

What’s the difference between transactional and promotional SMS?

Transactional SMS are those that the users have opted to receive and they are usually generated by machine/API whereas promotional SMSs are bulk messages not specific to optin users. 

What are the benefits of bulk SMS for business?

Most businesses usually look for cheap bulk messaging, free bulk SMS or cheap SMS Service provider in India. What they don’t realize is bulk messaging by default is less expensive than any other medium of transactional or promotional communication. The following are the benefits of messaging that’s how business can use bulk SMS services–

  1. Sending of personalized and customized information
  2. Brand awareness to existing users or new users
  3. You can send critical alerts to users. Stock markets and banks use SMS service widely for this purpose.
  4. This is an effective tool for internal or organizational communication
  5. It is still the fastest way to delivery any kind of information.
  6. Automation within a business is not possible without online SMS services.

How to choose the best bulk messaging partner?

A good messaging partner will care for your recipients as much as you do. The following can be the parameters to choose the best Bulk SMS Service provider–

  1. Easy API: Sending bulk SMS to lakhs of recipients must come in handy. Your bulk SMS gateway provider must give you a very easy API or admin panel that disseminates SMS via its SMS gateway in a blink.
  2. Sure-shot SMS delivery: The best bulk SMS partner will have re-routing of messages so effectively that each recipient receives the message come what may.
  3. Add-ons: A convenient bulk SMS solutions company should have easy add-ons. For instance, C2SMS various add-ons like bulk sms excel plugin, bulk sms mobile app, rewarding reseller program etc will give you endless opportunities to make your business communication easy, smooth, productive and easy on pocket.
  4. International bulk SMS service: The best bulk messaging provider will give you international bulk SMS gateway facility by default. C2SMS gives you bulk international sms service in 190+ countries across various sectors and industries.

Does C2SMS have dedicated OTP service and does it supports International SMS?

Yes,  we do have OTP sms for International with voice otp backup.

Is DLT mandatory and can I able to send SMS with DLT registration ?

Yes,  DLT registration is mandatory, and you can still able to send API sms with our default sender id for few days.