: It identifies if the key is "Live" (real money) or "Test" (sandbox mode).

: This is the crown jewel of Stripe integration. It must be kept strictly confidential and stored securely on the server side. If an attacker gains access to a secret key, they can create payments, issue refunds, access customer data, change payout locations, and cause massive financial damage. A live secret key follows the format sk_live_... , while a test key follows sk_test_... .

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