[Authorize.Net] How is «API Login ID» used?

1. Magento\Authorizenet\Model\Authorizenet::getRequest()

2. Magento\Authorizenet\Model\Directpost::validateResponse()

3. Magento\Authorizenet\Model\TransactionService::loadTransactionDetails()

4. Magento\Authorizenet\Model\Directpost\Request::setConstantData()

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