{"blocks": [{"key": "a09ced8b", "text": "Question", "type": "header-two", "depth": 0, "inlineStyleRanges": [], "entityRanges": [], "data": {}}, {"key": "131266db", "text": "Design a payment system for an online game that supports in-game currency transfers between accounts. Provide data models and APIs to enable: 1) querying any account’s total inflow and outflow over the past 24 hours, and 2) retrieving an hourly balance time series for the past 30 days for any account.", "type": "unstyled", "depth": 0, "inlineStyleRanges": [], "entityRanges": [], "data": {}}], "entityMap": {}}