I just started testing a new SIM integration yesterday, but the sandbox url https://sandbox.authorize.net/gateway/transact.dll keeps returning a 404 with the message "The resource you are looking for has been removed, had its name changed, or is temporarily unavailable."
Did the sandbox URL change?
Here is a sample of my SIM request form, with x_login and x_fp_hash masked:
<form name="fixed_donate_form" id="fixed_donate_form" action="https://sandbox.authorize.net/gateway/transact.dll" method="post">
<fieldset class="donation-payment-info">
<legend>Payment Information</legend>
<br class="clear">
<div class="submit-values">
<a class="main-form-link-button" href="spinners.php" title="Go back and make changes.">Back</a>
<input type="submit" name="submit" id="submit" class="main-form-button" value="Proceed to Payment Form">
<div id='sim-fields'>
<input type="hidden" name="x_amount" value="50">
<input type="hidden" name="x_cust_id" value="14741">
<input type="hidden" name="x_description" value="Temporary SIM description">
<input type="hidden" name="x_delim_data" value="TRUE">
<input type="hidden" name="x_email_customer" value="TRUE">
<input type="hidden" name="x_fp_hash" value="b89fe033479e5785b2f998fxxxxxxxxx">
<input type="hidden" name="x_fp_sequence" value="53">
<input type="hidden" name="x_fp_timestamp" value="1447874742">
<input type="hidden" name="x_invoice_num" value="53">
<input type="hidden" name="x_login" value="xxxxxxxxxxxxxx">
<input type="hidden" name="x_relay_response" value="FALSE">
<input type="hidden" name="x_show_form" value="PAYMENT_FORM">
<input type="hidden" name="x_version" value="3.1">
<input type="hidden" name="x_delim_char" value=",">
</div>
</div>
</fieldset>
</form>
It is also worth noting that attempting to go directly to the URL in a browser also returns a 404. Seems like it used to return an error response code about the API login or transaction key being wrong.
Thanks, Fritz
