- Login to your WHMCS Admin Area and go to Setup->Products/Services->Products/Services
- Create a new product, for the type select Other Product/Service and select your server monitoring group and enter a name for your SMS Package, e.g. 20 SMS Credits
- Uncheck Require Domain and select None for your welcome email.
- Click on the Module Settings tab, then select Servering from the drop down list
- Leave the max checks allowed for this package blank
- In the Included SMS Alerts on Account Creation field enter in how many sms credits this package gives the user.
- Check the SMS Credit Package option
- Select the automatic setup field accordingly, we recommend using Automatically setup the product as soon as the first payment is received
- Click the Pricing tab and set the item as a one time purchase and enter in any price you would like.
You can repeat these steps to create as many different packages as you would like.