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Unfortunately you cannot use the Authorize.Net integration to the Ticket Purchase widget at this time.
The custom payment of Ticket Purchaser widget work for Paypal integration because in Paypal, there is a custom payment amount option --- that feature was the one used in the custom payment.
The Authorize.Net tool doesn't have the Custom Donation/Payment option, so it could not work.
What you can probably do instead is just use the payment items using the Authorize.Net integration. Just add Tickets as the products/items in the payment tool.
Hope this help. Please let us know if there is more we can assist you with.