This question evaluates a product manager's competency in defining and interpreting product metrics, making prioritization trade-offs, and performing metric-driven investigation for a consumer payments system across social apps.

Assume you are the PM for Meta Pay, the consumer payments system used across Meta apps (e.g., Messenger, Instagram, Facebook) that powers peer-to-peer (P2P) payments and on-platform checkouts.
a) What are the North Star and supporting metrics that define Meta Pay’s success?
b) Next year you can ship only one of two features:
c) The North Star metric is flat, yet cost per transaction has fallen. How would you investigate and debug this discrepancy?
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