I want to know about limit of Send Push Notification API call each price.

PlayFab is consumption-based, the SendPushNotification API is metered under the Content & Configuration Reads section:

https://docs.microsoft.com/en-us/gaming/playfab/features/pricing/meters/file-reads

The calculation of the Content and Configuration read meters is similar to Profile read meters, which is based on the size of the data, for more details, please see:

https://docs.microsoft.com/en-us/gaming/playfab/features/pricing/consumption-best-practices#content-and-configuration

https://docs.microsoft.com/en-us/gaming/playfab/features/pricing/consumption-best-practices#data-and-statistics

At PlayFab.com/Pricing , Content and Configuration Reads for Free, Standard, and Premium Plan are:

• 20,000 Reads,
• 200,000 Reads, $0.0025 per additional 1k reads
• 15 Million Reads, $0.0024 per additional 1k reads

Therefore, the number of SendPushNotification calls you can make is based on the average size of the payload of notifications sent, you can make more calls if the average size is small compared to larger average size. And, please note that you can make calls as many as you want in Standard and Premium Plans, PlayFab will charge you for every additional 1K reads.