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- Pre-Paid metered billing
As per screenshot below, enable metered billing, change type to Pre-Paid. With this method customer pays X amount of money up-front and his credit account is decreased with each sms sent.
If customer credit balance reaches threshold level, new invoice to top-up his credit will be issued.
- Post-Paid metered billing
With this setup customer pays at the end of billing period (ie. Month) for the total amount of text messages he sent in this period.
- Regular (recurring) billing
Using regular billing you can give customer X amount of messages to sent in month, and charge him each month (no matter if customer used up all his messages or not)
