I see you signed up with a promotion for half off the Essential package for one month. The Essential package is typically $45, so you were charged $22.50 for the first month instead. The next month's charge will be the full $45 unless you would like to downgrade to the basic package for 0-500 contacts, $20.
If you need help with getting this set up or more of an explaination the billing team will be happy to help.
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