I've always found Whatsapp a terrible name, but its so established now that 'apping' is understood. If you're big enough it seems that a bad name hardly hold you back.
"To whatsapp" is a common verb, but I have never heard anyone say "apping".
Where do you live where "apping" is understood?
Can confirm that it's an extremely common verb in The Netherlands.
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Reminds me of the old joke:
After Bill and Melinda Gates have their honeymoon, Melinda says, "Now I know why you call it Microsoft."