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billingStart

A Schema.org Property

This term is proposed for full integration into Schema.org, pending implementation feedback and adoption from applications and websites.
Specifies after how much time this price (or price component) becomes valid and billing starts. Can be used, for example, to model a price increase after the first year of a subscription. The unit of measurement is specified by the unitCode property
Values expected to be one of these types
Number
Used on these types
UnitPriceSpecification

Source

https://github.com/schemaorg/schemaorg/issues/2689