Issue The following errors have occurred. (13) The merchant login ID or password is invalid or the account is inactive. Solution This error relates to the Authorize.net error handling, and suggests that you've got a bad password or transaction key s...

You need to set the following in Settings -> Receipt Page -> Receipt Method in your Auth.Net account: Default Receipt Link URL: http://www.yoursite.com/system/payment/callback/authnet_sim/ Receipt Method: POST Receipt Link Text: SOMETHING_NOT_E...

You need to open the payment_page.tpl page and put the code like the following one there: [[Please choose from the following payment methods:]] <br /><br /> {foreach from=$gateways item=gateway} {if ($gateway.caption eq "PayPal" && $...

In the event you get the "unilateral" error message during a Paypal transaction, please refer to the following page on the Paypal website: https://developer.paypal.com/webapps/developer/docs/classic/ipn/integration-guide/IPNandPDTVariables/ [1] Ple...