Google does not give a definitive answer as to how I can verify a business in GMB without postcards. It says that some businesses MAY be eligible for phone/email verification. Also, some businesses MAY be eligible for instant GMB verification through Search Console. But there's no definitive answer.
I remember reading somewhere that this workaround can be useful:
Create listings on business directories such as YP, CitySearch and Yelp.
Google will then automatically create a Maps listing for…
Google my business verification WITHOUT postcard?
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