Derive a JSON Schema From a Real Payload

Create a first validation schema for a customer import sample: {customer_id, email, plan, seats, trial_ends_at}. The import feeds billing and onboarding. Four-pass schema drafting: grain, required fields, typed constraints, extra-property policy. The common trap is copying every observed field as required because it appeared in the sample. That turns an example into an accidental contract and blocks valid future records. Choose the grain Top-level value is one customer object, not an array batch or a billing event. A schema should validate the unit your workflow processes. Batch wrappers can have their own schema later. Mark required fields customer_id, email, and…

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