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POST /v1/checkout/sandbox/simulate Test-mode only (sk_test_... / pk_test_...) — marks a test checkout as paid (or failed) without any real money moving, so you can test your integration end-to-end.
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string
required
The reference from a checkout initialized in test mode
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string
default:"success"
success or failed
Calling this with a live key returns a 403:
A successful simulation fires the same webhook a real payment would, so you can test your webhook handler end-to-end too.