Can we submit via JSON a batch containing less than 100 messages?

Technically yes... but this isn't recommended!

Using a JSON batch is most commonly used when you need to send a large, ad-hoc campaign upwards of 100,000 SMS where you want to send the entire batch to us in one go and have our system process the file, queue the messages and send them out. 

Although, technically, the JSON batch can handle up to 1M SMS, if you have a smaller amount of messages (generally anything less than 100,000), we'd suggest using RECIPIENTMESSAGES instead - this can handle up to 100 SMS at a time and up to 3 threads, effectively giving you a throughput of 300SMS/sec. 

For more information, take a look at the REST API doc.

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