How is \Magento\Sales\Model\Order\Payment::transactionAdditionalInfo declared and used?

Declaration

Usage

1. \Magento\Sales\Model\Order\Payment::addTransaction()

Details: How is \Magento\Sales\Model\Order\Payment::addTransaction() implemented and used?

2. \Magento\Sales\Model\Order\Payment::setTransactionAdditionalInfo()

Details: How is \Magento\Sales\Model\Order\Payment::setTransactionAdditionalInfo() implemented and used?

3. \Magento\Sales\Model\Order\Payment::getTransactionAdditionalInfo()

4. \Magento\Sales\Model\Order\Payment::resetTransactionAdditionalInfo()