Is there a name for this “credit system” for membership content?

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Is there a name or plugin that I can look into to implement something similar to the below examples?

[https://leadonion.ai/pricing-usd/])

[https://seamless.ai/pricing])

For example, a user would pay $50 per month to receive 100 credits per month. The user needs to use 10 credits to unlock some content. Once the credits are depleted in a given month, the user can either buy more credits or wait until next month.

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