When I call the api of getting payment gateway api I am getting it as "paymentGatewayApi": "BLACKHOLE" Clover
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The Blackhole gateway is the default gateway for Sandbox merchants. It sets all transactions to be successful and suffices for most development use cases.
We do have another payment gateway available that is configured to validate the transaction data. You can email dev@clover.com with your merchant ID to request that change.