Here is the way by which we can work with authorize.net. You can also work with Create New Sandbox and then Login to Sandbox Account. The steps provided here are worked for me and for code implementation, I used "Authorize Credit Card" which worked for me to my Sandbox Account.
Few things that you need to have to work with this is
(1) API Login ID
You will find login id from your account under Login to Sandbox --> Account Menu --> Security Settings --> General Security Settings --> Click on "API Credentials & Keys" link
(2) Transaction Key
You will find this transaction key from your account under Login to Sandbox --> Account Menu --> Security Settings General Security Settings --> Click on "Manage Public Client Key" link
From the same menu Login to Sandbox --> Account Menu --> Security Settings General Security Settings, you can also set
(3) MD5-Hash
(4) Test Mode - While your account is in Test Mode there will be only processing occurred not exact operation will be performed, but to work with live account after testing to charge/authorize your payment it should be in live mode.
Alternatively, you can also set few more things like
(1) Receipt Page :- Used to send payment information with all required information like API Login Id/Transaction Key/Payment information etc.
(2) Response/Receipt URLs :- Used when operation has been completed from Step-(1) and it sends response of the transaction indicating whether it is success/failure of the transaction.
by navigating to Login to Sandbox --> Account Menu --> Transaction Format Settings --> Transaction Response Settings
Set all this stuff to your sandbox account, You will get C# Sample Code as well. In that set required information to the code and set method of payment which you want to do like you can Charge Credit Card, Authorize Credit Card and so on.
Once this configuration and code with your account configuration execute with code provided based on the method(Charge Credit Card, Authorize Credit Card) selected you will find that thing under Login to Sandbox --> Search Menu --> Unsettled Transactions on success of your transaction.
Once you will are success with Sandbox account, for your live account you can check same thing under "Test Mode" account and to check with your actual transaction make it "Live" from "Test" mode.
That's it for the authorize.net implementation.
