So far, this Get Started exercise has used API Explorer and the Developer Console. Now, you use the Sandbox Square Dashboard to see how sellers verify the payment.
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On the Sandbox test accounts page in the Developer Console, choose Square Dashboard next to Default Test Account. This link opens the Sandbox Square Dashboard associated with the default test account.

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In the Sandbox Square Dashboard, choose Transactions.
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On the Transactions page, choose the payment you made. If you don't see your payment, select a date range that includes your payment.