Basic Plan: $44.99/month and $39.99/month if billed yearly with 30 Document Credits for 1 user seat.
（四）非法拦截或者强登、扒乘机动车、船舶、航空器以及其他交通工具，影响交通工具正常行驶的；
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This makes sense. These keys were designed as project identifiers for billing, and can be further restricted with (bypassable) controls like HTTP referer allow-listing. They were not designed as authentication credentials.
The whole data model fits in two tables: