Unlikely. The sale of digital goods, software and SaaS products is not currently taxable in Missouri.
No. You don't owe tax for the sale of cloud software subscriptions to customers in Missouri.
No. You don't owe tax for the sale of software downloads to customers in Missouri.
No. You don't owe tax for the sale of eBooks to customers in Missouri.
No. You don't owe tax for the sale of digital downloads to customers in Missouri.