I would like to see WHMCS add billing cycle to be 30 days, for example if someone paid today Nov 18 2019, it will charge him on Dec 18 2019 while this is 31 days instead of 30 days billing cycle
Thanks for your taking the time to submit your suggestion. At present WHMCS uses PHP's date logic to calculate by how much to move a Next Due Date forward. The monthly billing cycle option will increment forward by 1 month as defined by PHP. A discussion of this is located here: https://docs.whmcs.com/Billing_Logic#Billing_Cycles
A 30 day billing cycle could result in customers losing days over the course of a few years, as 365/30 =/= 12 months.
But if there is demand for this and this caveat is not a problem in that case, it's potentially something we can consider.
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