PayPal IPN Posting Twice

Question

I have a test page called order.cfm. This page posts to
PayPal for payments. I have a file called ipn.cfm which waits for
PayPals verification. However, it is being executed twice. The
first time through it has all the form variables, but the sencond
time it does not. How can I stop it from being posted twice. Below
is my code:
ORDER.CFM
<form action="https://www.paypal.com/cgi-bin/webscr"
method="post">
<input type="hidden" name="cmd" value="_cart">
<input type="hidden" name="upload" value="1">
<input type="hidden" name="business"
value="mybusiness@mybusinesscom">
<input type="hidden" name="item_name_1" value="Item Name
1">
<input type="hidden" name="amount_1" value="0.01">
<input type="hidden" name="invoice" value="101">
<input type="hidden" name="tax_cart" value="0.00">
<input type="hidden" name="shipping" value="0.00">
<input type="submit" value="PayPal">
</form>
IPN.CFM
<cfheader statuscode="200" statustext="OK">
<cffile action="append"
file="#GetDirectoryFromPath(GetBaseTemplatePath())#IPN_log.txt"
output="THIS PAGE HAS BEEN CALLED ON
#DateFormat(Now(),'mm/dd/yyyy') & TimeFormat(Now(), '
hh:mm:ss')#" addnewline="yes">
<cfset x = GetHttpRequestData()>
<cfset str="cmd=_notify-validate&" & x.content>
<!---post back to PayPal for validation--->
<cfhttp url="https://www.paypal.com/cgi-bin/webscr?#str#"
method="GET" resolveurl="no">
</cfhttp>
<cffile action="append"
file="#GetDirectoryFromPath(GetBaseTemplatePath())#IPN_log.txt"
output="
Paypal Says the transaction is: #CFHTTP.FileContent#
Transaction status: #FORM.payment_status#
Seller account: #FORM.RECEIVER_EMAIL#
addnewline="yes">
<cfloop index="TheField" list="#Form.FieldNames#">
<cfset str = str &
"#LCase(TheField)#=#URLEncodedFormat(Form[TheField])#">
<cffile action="append"
file="#GetDirectoryFromPath(GetBaseTemplatePath())#IPN_log.txt"
output="#LCase(TheField)#----#(Form[TheField])#"
addnewline="yes">
</cfloop>
<cfoutput>
<!--- Payment verified --->
<cfif CFHTTP.FileContent is "VERIFIED">
VERIFIED<br />
<!-- check that payment_status=Completed -->
<cfif FORM.payment_status eq "Completed">
Completed<br />
<!-- check that receiver_email is your email address
(that money went into your account -->
<cfif FORM.RECEIVER_EMAIL eq
"[email protected]">
Paypal says the funds went into your account<br />
<!--- Everything checked ok, add your action here
(typically you would want to update your database here --->
<cfelse>
<!--- The receiver email doesn't match. Log this as
possible fraud --->
The receiver email, #FORM.RECEIVER_EMAIL#, doesn't match.
</cfif>
</cfif>
<cfelseif CFHTTP.FileContent is "INVALID">
<!-- The information is not valid, please investigate and
trace invalid info -->
Invalid Info<br />
<!---Something that was purchased was invalid, either the
order or the information provided. This is usually good to log in
case someone is trying to purchase with stolen card numbers, etc.
Here simply place a QUERY tag that insert the data above into a
database.--->
<cfelse>
Error<br />
<!-- ERROR -->
<!---This usually means that something went wrong along
the way, you can use this area to log it and keep for your
records.--->
</cfif>
</cfoutput>

Answer 1

What do you mean about entering details again, do you mean when they are on paypal?