Merchants are able to perform additional actions on transactions that have been already created directly from the Magento 2 Admin page.
Capture
Merchants who choose to authorize only at checkout (Authorize and Delayed Settlement) can capture their orders for a fixed period of time after the initial authorization.
To capture an order:
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Navigate to Magento | Orders.
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Click Invoice for the order you want to capture.

Void
Merchants are able to cancel sale transactions when the sale is in either Authorized or Captured state.
To void a sale transaction:
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Navigate to Magento 2 | Orders.
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Select the order you want to cancel.
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Click Void.
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The transaction is voided in Converge, and the status of the order in Magento 2 becomes Processing.

Refund – full and partial
You should be able to partially or fully refund a transaction if the Converge status is “Captured”, “Settled” or “SettlementDelayed”.
To refund an order:
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Navigate to Magento | Sales | Invoices.
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Select the invoice you want to refund.
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Click Credit Memo.
A Refund Totals form displays
Magento 2 Admin – Credit Memo -
To proceed with refunding:
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For a full refund, the amount should be equal to the entire amount (Grand Total).
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For a partial refund, the amount should be smaller than the entire amount.
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Add credit memo comments (optional).
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Click Refund.
Magento 2 Admin – Refund In the Order details, there will be a note to let you know that a refund has been processed.
Magento 2 Admin – Order notes for refund