To plays a central role in determining its ability to create positive network effects, there are three crucial categories of metricsliquidity, matching quality, and trust.

Liquidity in a platform marketplace is a state in which there are a minimum number of producers and consumers and the percentage of successful interactions is high. When liquidity is achieved, interaction failure is minimized, and the intent of users to interact is consistently satisfied within a reasonable period of time. Achieving liquidity is the first and most important milestone in the life cycle of a platform. On an information and entertainment platform, an interaction might be the click-through that takes a consumer from a headline to a complete story; on a marketplace platform, it might be the purchase of a product; on a professional networking platform, it might be the offer of a recommendation, the swapping of contact information, or a posted response to a question on a discussion page.

Matching Quality, This refers to the accuracy of the search algorithm and the intuitiveness of the navigation tools offered to users as they seek other users with whom they can engage in value-creating interactions. Matching quality is critical to delivering value and stimulating the long-term growth and success of the platform. It is achieved through excellence in product or service curation. One way to measure the efficiency of the platform in successfully matching producers to consumers is by tracking the sales conversion rate, which can be expressed as the percentage of searches that lead to interactions.

Trust refers to the degree to which users of a platform feel comfortable with the level of risk associated with engaging in interactions on the platform. It is achieved through excellent curation of participants in the platform.

What is Paypal doing for the three metrics and How is Paypal doing for the three metrics,