fix: mixed content · Pear104/Summer2024SWP391_SAP1804_Group01@a473432

XML comment has badly formed XML -- 'Reference to undefined entity 'amount'.'

XML comment has badly formed XML -- 'Reference to undefined entity 'extraData'.'

XML comment has badly formed XML -- 'Reference to undefined entity 'ipnUrl'.'

XML comment has badly formed XML -- 'Reference to undefined entity 'orderId'.'

XML comment has badly formed XML -- 'Reference to undefined entity 'orderInfo'.'

XML comment has badly formed XML -- 'Reference to undefined entity 'partnerCode'.'

XML comment has badly formed XML -- 'Reference to undefined entity 'redirectUrl'.'

XML comment has badly formed XML -- 'Reference to undefined entity 'requestId'.'

XML comment has badly formed XML -- 'Reference to undefined entity 'requestType'.'

Non-nullable property 'data' must contain a non-null value when exiting constructor. Consider declaring the property as nullable.

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