CHW-4404 BillingBodyInvalid
billing request body was missing or malformed; see /api/billing documentation for the expected shape
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Default message: billing request body was missing or malformed; see /api/billing documentation for the expected shape
HTTP status:400(client)
Problem. /api/billing/checkout or /api/billy/chat returned 400
before any plan logic. Cause. The request body was missing, empty,
or malformed JSON. Fix. Re-send with a valid JSON body matching
the endpoint schema. HTTP 400.