paypal webcheckout with coldfusion

gistfile1.cfm

<!--- STEP 1 - ?event=shop-cart.cfm --->
<cfscript>
  stDetails = structNew();
  stDetails.cartTotal = 200.00;
  stDetails.invoiceno = 3;
</cfscript>

<cfhttp url="https://api-3t.paypal.com/nvp" method="post">
	<!--- auth --->
	<cfhttpparam type="formfield" name="USER" value="#application.pp.username#" />
	<cfhttpparam type="formfield" name="PWD" value="#application.pp.password#" />
	<cfhttpparam type="formfield" name="SIGNATURE" value="#application.pp.signature#" />
	<!--- order info --->
	<cfhttpparam type="formfield" name="METHOD" value="SetExpressCheckout" />
	<cfhttpparam type="formfield" name="VERSION" value="93.0" />
	<cfhttpparam type="formfield" name="LOCALE" value="AU" />
	<cfhttpparam type="formfield" name="PAYMENTREQUEST_0_AMT" value="#stDetails.cartTotal#" />
	<cfhttpparam type="formfield" name="PAYMENTREQUEST_0_INVNUM" value="#stDetails.invoiceno#" />
	<cfhttpparam type="formfield" name="PAYMENTREQUEST_0_CURRENCYCODE" value="AUD" />
	<cfhttpparam type="formfield" name="PAYMENTREQUEST_0_DESC" value="your products" />
	<cfhttpparam type="formfield" name="returnURL" value="http://#cgi.server_name#/index.cfm?event=shop-cart-process" />
	<cfhttpparam type="formfield" name="cancelURL" value="http://#cgi.server_name#/index.cfm?event=shop-cart-process" />
</cfhttp>

<!--- credit to @davidsirr on nice processing of the response ---->

<cfset PPresponse = {token='',ack='',CORRELATIONID=''} />

<cfif cfhttp.filecontent GT ''>
	<cfloop list="#cfhttp.filecontent#" delimiters="&" index="curItem">
		<cfset PPresponse[listFirst(curItem,'=')] = URLDecode(listLast(curItem,'=')) />
	</cfloop>
</cfif>

<cfif PPresponse.ack contains 'SUCCESS' AND PPresponse.token NEQ ''>
	<cflocation addtoken="no" url="https://www.paypal.com/webscr?cmd=_express-checkout&token=#PPresponse.token#" />
<cfelse>
	<cfthrow type="cart.paypal" message="An error occured connecting to PayPal" />
</cfif>

<!--- Step 2 - ?event=shop-cart-process --->

<cfhttp url="https://api-3t.paypal.com/nvp" method="post">
  	<!--- auth --->
	<cfhttpparam type="formfield" name="USER" value="#application.pp.username#" />
    	<cfhttpparam type="formfield" name="PWD" value="#application.pp.password#" />
	 <cfhttpparam type="formfield" name="SIGNATURE" value="#application.pp.signature#" />
	<!--- order info --->
	<cfhttpparam type="formfield" name="METHOD" value="GetExpressCheckoutDetails" />
	<cfhttpparam type="formfield" name="VERSION" value="93.0" />
	<cfhttpparam type="formfield" name="token" value="#url.token#" />
</cfhttp>

<cfset PPresponse = {} />

<cfif cfhttp.filecontent GT ''>
	<cfloop list="#cfhttp.filecontent#" delimiters="&" index="curItem">
		<cfset PPresponse[listFirst(curItem,'=')] = URLDecode(listLast(curItem,'=')) />
	</cfloop>
</cfif>

<cfif structKeyExists(PPresponse,'ack') AND PPresponse.ack eq "success">
	<cfscript>

		session.cart.payerid = url.payerid;
		session.cart.token = url.token;

		session.shipping = {};
		session.shipping.email = PPresponse.email;
		session.shipping.deliveryName = PPresponse.firstname & ' ' & PPresponse.lastname;
		session.shipping.countryCode = PPresponse.shiptocountrycode;
		session.shipping.country = PPresponse.shiptocountryname;
		session.shipping.deliveryName = PPresponse.shiptoname;
		session.shipping.suburb = PPresponse.shiptocity;
		session.shipping.state = PPresponse.shiptostate;
		session.shipping.address1 = PPresponse.shiptostreet;
		if(structKeyExists(PPresponse,'shiptostreet2')){
			session.shipping.address2 = PPresponse.shiptostreet2;
		}else{
			session.shipping.address2 = '';
		}
		session.shipping.postcode = PPresponse.shiptozip;
	</cfscript>
	
	<cflocation url="?view=shop-cart-success" addtoken="false" />
<cfelse>
	<cfset errorMessage = 'Checkout failed: An error occured connecting to PayPal'>
</cfif>

<!--- Step 3 - ?view=shop-cart-success --->

<cfhttp url="https://api-3t.paypal.com/nvp" method="post">
  	<!--- auth --->
	<cfhttpparam type="formfield" name="USER" value="#application.pp.username#" />
    	<cfhttpparam type="formfield" name="PWD" value="#application.pp.password#" />
    	<cfhttpparam type="formfield" name="SIGNATURE" value="#application.pp.signature#" />
	<!--- order info --->
	<cfhttpparam type="formfield" name="METHOD" value="DoExpressCheckoutPayment" />
	<cfhttpparam type="formfield" name="VERSION" value="93.0" />
	<cfhttpparam type="formfield" name="LOCALE" value="AU" />
	<cfhttpparam type="formfield" name="PAYERID" value="#session.cart.payerid#" />
	<cfhttpparam type="formfield" name="TOKEN" value="#session.cart.token#" />
	<cfhttpparam type="formfield" name="PAYMENTREQUEST_0_AMT" value="#session.cart.cartTotal#" />
	<cfhttpparam type="formfield" name="PAYMENTREQUEST_0_INVNUM" value="#session.cart.invoiceid#" />
	<cfhttpparam type="formfield" name="PAYMENTREQUEST_0_CURRENCYCODE" value="AUD" />
	<cfhttpparam type="formfield" name="PAYMENTREQUEST_0_DESC" value="your products" />
</cfhttp>

<cfset PPresponse = {token='',ack='',PAYMENTINFO_0_TransactionID=''} />

<cfif cfhttp.filecontent GT ''>
	<cfloop list="#cfhttp.filecontent#" delimiters="&" index="curItem">
		<cfset PPresponse[listFirst(curItem,'=')] = URLDecode(listLast(curItem,'=')) />
	</cfloop>
</cfif>

<!--- check on the success --->
<cfif PPresponse.ack EQ "success">
	<cfscript>
		session.cart.success = true;
	</cfscript>

	<cflocation url="/index.cfm?view=shop-cart-thankyou" addtoken="false" />
  
<cfelse>
	<cfthrow type="paypal.DoExpressCheckoutPayment" />
</cfif>

<!--- process a successful order however you like! --->