Gupshup
This provider in his own words
Augment your customer support initiatives by being on the most ubiquitous channel. Gupshup’s WhatsApp self-serve solutions help you engage your customers in a simple, secure and reliable way.
Benefits
- low cost
- Phone number for testing - Free
- Uses the customer's own phone number when in production - Free
How to create a user account
Minimum requirements
- Have an account on one of these services: Google, Github or Facebook
Steps
- Open this link in a new browser window
- Click in the Login/Sign Up button

- Choose your authentication provider. Github is perhaps the most practical, you can have an account with it even if you don't have a Google or Facebook account.
If everything went well, you will see something like this:
