Linkpoint API Payment Module

#1 Submitted on Mon, 10/08/2007 - 15:50 Top View page

Joined: 08/17/2007

Juice: 90

I was getting an error telling me the Credit Card Expiration Year was incorrect when I tried to process credit cards. I did a little more research and found linkpoint needs the years to be in 2 digits instead of 4 digits.

In the linkpoint module there is a line that is supposed to truncate the year down to 2 digits:

$xml .="<cardexpyear>" . date('y', $order->payment_details['cc_exp_year']) . "</cardexpyear> ";

This wasn't working for me so I removed that line and replaced it with:

$cardexpyr = substr($order->payment_details['cc_exp_year'], 2, 2);
$xml .="<cardexpyear>" . $cardexpyr . "</cardexpyear> ";

As of 10/8/2007 this module appears to be fully functioning for me.

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#2 Submitted on Mon, 10/15/2007 - 16:00 Top View page

Guest (not verified)

Another issue with Linkpoint is the country code is supposed to be 2 letters. For example:

US for USA
CA for Canada.

The problem is Ubercart stores the countries as numbers. For example:

USA is 840
CA is 124

For the time being, I devised a ghetto little rig to convert these numbers to the 2 letters needed by Linkpoint.

Add the lines to the uc_linkpoint_api.module file:

Original file:

$description = substr($description, 0, 255);
*/
  $xml ="<order>";

Modified file:

$description = substr($description, 0, 255);
*/
$countrybill = $order->billing_country;
  if ($countrybill == 840) {
    $countrybill = "US";
  } else if ($countrybill == 124) {
    $countrybill = "CA";
  }
  $xml ="<order>";

After you do that, find the line that says:

$xml .="<country>" . $order->billing_country . "</country>";

and replace it with:

$xml .="<country>" . $countrybill . "</country>";

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#3 Submitted on Thu, 12/13/2007 - 18:49 Top View page

pat

Joined: 11/22/2007

Juice: 7

This module contains some code from the linkpoint lphp.php file decodeXML function. This file has a copyright notice on it.

I have a rewritten module without copyright code I will post soon.

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#4 Submitted on Tue, 01/29/2008 - 18:01 Top View page

mrpoptart

Joined: 01/15/2008

Juice: 42

Some non-dedicated hosting companies do not give cURL access to certain ports.

This means that GoDaddy will NOT work with this module if you have a shared hosting server.

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#5 Submitted on Thu, 02/07/2008 - 15:51 Top View page

jodo

Joined: 01/10/2008

Juice: 28

I posted this in the general forum in error as I thought I was adding it to this thread of nick's.
http://www.ubercart.org/forum/general_discussion/3064/linkpoint_yourpay_...

Question as posted:

Ubercart tells me "Your order is complete!" I get no other feedback. And there is nothing in watchdog indicating any errors. This is LIVE Production mode.
When I check for the transaction on the linkpoint/yourpay site there is none.

Linkpoint_api_module here:
/home/xxx/www/mydomain.com/sites/all/modules/ubercart/payment/uc_linkpoint_api/uc_linkpoint_api.module

pem file here:
/home/xxx/www/mydomain.com/sites/all/modules/ubercart/payment/uc_linkpoint_api/1234567890.pem

What is the best way to debug this? How to see what is being passed to linkpoint?

apologies for the "double" post

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#6 Submitted on Fri, 02/08/2008 - 10:04 Top View page

Nick

Joined: 08/17/2007

Juice: 90

What I did to see more debug info was edit the following lines:

'message' => t('Credit card payment declined: !text', array('!text' => $x_response_text)),
'message' => t('Credit card payment processed successfully. Approval code: !code', array('!code' => $approved_text)),

to

'message' => t('x_response_code:'. $x_response_code .'<br />x_approval_code:'.$x_approval_code.'<br />xml: '.$xml.'<br />Credit card payment declined: !text', array('!text' => $x_response_text)),
'message' => t('x_response_code:'. $x_response_code .'<br />x_approval_code:'.$x_approval_code.'<br />xml: '.$xml.'<br />Credit card payment processed successfully. Approval code: !code', array('!code' => $approved_text)),

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#7 Submitted on Sat, 02/09/2008 - 23:42 Top View page

jodo

Joined: 01/10/2008

Juice: 28

Thanks for the code, Nick. Assuming I installed it correctly I still get no feed back except the standard "Order complete."
So I don't know if linkpoint is receiving anything or not.
I am using the standard test number 4111111111111111. (Linkpoint tech told me it is not a problem using that number)
Any ideas on how I can tell if my server is shaking hands with theirs?

Another issue in looking at the order report under the admin/store/orders/69/payments there is no info recorded regarding the payment. It's all blank. This indicates to me something is not being completed even though the cart says it is.

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#8 Submitted on Sun, 02/10/2008 - 20:22 Top View page

mimetic2

Joined: 08/07/2007

Juice: 392

Hi,

I keep trying to process a card (i'm going through ubercarts backend) and it keeps going blank after i go to charge card.

Does nayone know why this is?

I cant seem to get this to work =/

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#9 Submitted on Tue, 02/19/2008 - 01:49 Top View page

mimetic2

Joined: 08/07/2007

Juice: 392

I transfered servers and now the module works...SO it mustve been something with my server configuration.

Thanks nick for the great module

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#10 Submitted on Thu, 04/10/2008 - 18:32 Top View page

rmarc71

Joined: 03/07/2008

Juice: 5

Just wanted to toss this out to whomever is using this API. I'm using linkpnt via YourPay and found an issue with this where I'd get errors: SGS-020003.
This is an invalid XML error. After much lack of help from their support,
I found this in their manual:

SGS-020003: Invalid XML

There are a couple different things that will cause this error.

1. Make sure the amount for chargetotal is not blank.
2. Make sure expiration year is only 2 digits
3. Make sure there is no dollar sign for the amount.
4. Make sure there are no symbols like an ampersand,
apostrophe, or letters with accents
5. If there is no shipping make sure you pass zero for the amount
6. Make sure there are no commas in the amount for chargetotal

The issue I have is a LOT of my commercial customers have an & or an
apostrophe in their company names.

I had to add the following to the module:

/* remove ampersand and appostrophes from text */
$xml = str_replace("&", "and", $xml);
$xml = str_replace("'", " ", $xml);
/* end scrub */

Now things are happier.

R. Marc

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#11 Submitted on Thu, 07/24/2008 - 15:16 Top View page

signalpoint

Joined: 07/24/2008

Juice: 14

Hello Linkpoint API Module Crew,

I am having a problem when clicking "Submit Order" on the "Review order" page, e.g. https://www.domain.com/cart/checkout/review , the form submit hangs for a while then I get these error messages on a blank white page:

Warning: MySQL server has gone away
couldn't connect to host
Credit card declined: $0.50
Payment failed: Credit card payment declined: Sorry - Could not connect to payment gateway.

I assume SSL is working fine since https://www.domain.com/cart/checkout/review works ok.

I checked to see what my absolute path was and if curl is enabled using the following php code and received the output below:

$_SERVER['DOCUMENT_ROOT']
output: /home/account_name/public_html

var_dump(curl_version())
output: libcurl/7.18.2 OpenSSL/0.9.7a zlib/1.2.1.2 libidn/0.5.6

My settings at store/settings/payment/edit/gateways for the Linkpoint API are:

Store Number: xxxxxxxxxx (10 digits)
PEM File: /home/account_name/public_html/modules/ubercart/payment/uc_linkpoint_api/xxxxxxxxxx.pem
Transaction mode: Production
Transaction Type: Sale

I noticed that Linkpoint also gave me a 6 digit user id that is the same as the last 6 digits in the 10 digit store number. Should I be using the 6 digits instead of the 10 digits for the Store Number field?

Also, I noticed that when I first extracted the module into the /home/account_name/public_html/modules/ubercart/payment/uc_linkpoint_api directory, there is an 000000.pem.txt file in there with the instructions: "Delete all text within this file, then copy and paste your key from Linkpoint API here. Do not leave any whitespaces or returns at the end of the file. Then rename this file to your store id, 6 digits, with .pem as the file extension."

However, when I download my PEM file from Linkpoint, the file is named xxxxxxxxxx.pem (10 digits) and it has a trailing line break on the end of the file.

I have tried using the 6 digit user id as my store number, switching to the xxxxxx.pem (6 digit version with no trailing line break and no white space), switched between production and test modes, and still receive the same errors that I listed above.

Has anyone ran into a similar problem, or know of anything to fix this problem? Thanks!

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#12 Submitted on Fri, 08/15/2008 - 20:12 Top View page

hvitebjorn

Joined: 07/26/2008

Juice: 67

I did a few fixes for this module since I ran into a few issues:

- Added breakout of subtotal, tax, shipping and total cost so your customer doesn't get "shipping cost: 0, tax: 0"
- Added check for subtotal since payment will fail if subtotal <= zero. If this happens, reverts to using total only (no breakout of tax/shipping etc). Why would you ever have negative subtotal? We're using userpoints as payment and may have the situation that userpoints paid is less than total but more than subtotal.
- Fixed a few bugs related to the way the module formatted and sent credit card expiration date and security code.

UPDATE: sorry just saw there's a later update of this module which might already include these fixes... I was running 5.x-1.0-alpha6c

Attachment	Size
patch.txt	2.5 KB

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#13 Submitted on Thu, 08/21/2008 - 01:45 Top View page

roberto

Joined: 08/20/2008

Juice: 9

I'm getting this error:

"unable to use client certificate (no key found or wrong pass phrase?)"

This is my first setup and after using test gateway, then switching to processing an order using a real credit card via the LinkPoint API, in production mode.

Could there be something wrong with my pem file?

Thanks,

Robert

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#14 Submitted on Thu, 08/21/2008 - 03:31 Top View page

roberto

Joined: 08/20/2008

Juice: 9

Ahh - must have been some issue with the path - I repasted it in and now it works fine.

Robert

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#15 Submitted on Fri, 09/05/2008 - 09:45 Top View page

sam353

Joined: 08/12/2008

Juice: 33

It turns out if that if the linkpoint terminal had been previously used and there are already orders in there that match the order id the transaction will be denied.

I'm not sure what the best solution is, but in my case, I simply appended some letters to the order id so there wouldn't be a conflict -- in other words, instead of sending the #3 as order id, it sends UC3

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#16 Submitted on Thu, 10/02/2008 - 00:13 Top View page

maui1

Joined: 09/30/2008

Juice: 8

I have been trying to debug my Drupal-Ubercart with linkpoint api and have finally got to the point where it seems to send the order but returns a "Credit Card Denied" error with different known good cards.

I am wondering if I have the most current version as the file attached to the top message seems to be dated from 2007 but after reading message 12 it seems to indicate a more current 2008 version.

Could anyone point me to the most recent version and help me with what might be causing the "Credit Card Denied" error I keep getting.

Out of frustration I have installed Zen Cart to test to see if I might be having a server issue, but after configuring Zen Cart I was able to pass an order to linkpoint and have the transaction show up on their side. So I am thinking the problem must be with either my Drupal-Ubercart configuration or the Linkpoint api. Anyone else working with Drupal-Ubercart and Linkpoint?

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#17 Submitted on Tue, 10/14/2008 - 13:06 Top View page

signalpoint

Joined: 07/24/2008

Juice: 14

I was also having the same problems as rmarc71.

It turns out, the element inside the xml created by this module prints out the name of the product(s), which is "ok".

However, in some of my product names there is a "registered" Â® symbol, and the "trademark" â„¢ symbol, which when printed into an xml file without being escaped properly causes the xml to be invalid. And hence the SGS-020003: Invalid XML error.

Hopefully this helps others. Thanks to rmarc71 for steering me in the right direction.

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#18 Submitted on Fri, 11/14/2008 - 16:41 Top View page

WisTex

Joined: 11/14/2008

Juice: 2

The PEM file should not be accessible via the web (i.e. it should not be in your public_html folder). Ideally it should be uploaded to your root folder so Ubercart can get to it, but anonymous visitors to your website cannot.

A better location to upload it would be /home/domain/123456.pem instead.

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#19 Submitted on Thu, 02/26/2009 - 17:30 Top View page

HiFiGuy36

Joined: 02/26/2009

Juice: 2

I was just wondering if there was a plan to update this module to be compatible with Drupal 6.x and Ubercart 2.x?

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#20 Submitted on Thu, 03/05/2009 - 00:45 Top View page

fossle

Joined: 01/19/2009

Juice: 61

How did you append the letters to the orders?

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#21 Submitted on Mon, 03/09/2009 - 17:40 Top View page

scorrales

Joined: 02/19/2009

Juice: 22

I created a version of the LinkPoint API for UC 2.x. You can find it here - http://www.ubercart.org/forum/development/9567/linkpoint_api_drupal_6xub...

All I did was modify the .info file and a few other minor edits - nothing significant. This is pretty much the exact same code base as the UC 1.x version.

I've done very minimal testing so be careful using on sites - especially live sites! I still haven't ran a live transaction through this.

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#22 Submitted on Fri, 05/08/2009 - 00:28 Top View page

focal55

Joined: 05/07/2009

Juice: 2

Thank you very much for creating this module. I had a little trouble finding help on getting it to work, mostly because I am a noob. Here are some things to note for other noobs out there. Please note I dont warrant these tips are completely correct. It is just what worked for me and I humbly ask experts to correct anything I state incorrectly.

1. If your the developer and your client has YourPay - this module is for you. The LinkPoint links listed in the module directions above will work for you. In order to download the PEM file, you will need to know the exact first and last name your client used to sign up with the service. In my case, my clients name is Josh but he used Joshua to sign up.

2. You need SSL to pass information to LinkPoint. I understood that your need SSL for security, however I thought I could get away with fully testing with out SSL. The way the module is set up will actually partially test the credit card number when you go from the Billing Information page to the Review Order page. This was slightly misleading to me because it would pass the partial test however when I tried to complete the order I received an error. When I checked the Watchdog Error log, it said 'Payment failed: Credit card payment declined: Sorry - Could not connect to payment gateway'. This was due to my shared hosting provider (bluehost) not having port 1129 open for me. After buying the dedicated IP address I had to send in a request ticket to open up port 1129.

3. I also requested that my host give me SSH access so that I could better test that curL was actually getting to LinkPoint. Here is a cool command that I pieced together from web searches that you can enter into the command line:

curl -v -d "<order><orderoptions><ordertype>SALE</ordertype><result>GOOD</result></orderoptions><creditcard><cardnumber>4005550000000019</cardnumber><cardexpmonth>12</cardexpmonth><cardexpyear>12</cardexpyear><cvmindicator>provided</cvmindicator></creditcard><billing><name>Chad King</name><company></company><address1>6329 s paulina</address1><address2></address2><city>Chicago</city><state></state><zip>60636</zip><country>USA</country><phone>312-431-0251</phone><fax></fax></billing><shipping><state></state></shipping><transactiondetails><oid>e520402b948a7fc6bd403cd065ab132d</oid></transactiondetails><merchantinfo><configfile>XXXXXXXX</configfile><keyfile>/home/XXXXX/etc/linkpoint/XXXXXX.pem</keyfile><host>secure.linkpt.net</host><port>1129</port></merchantinfo><payment><chargetotal>34.35</chargetotal></payment></order>" -E <path to your .pem file> -k https://secure.linkpt.net:1129/LSGSXML

Replace [path to your .pem file] with the full location of your PEM file. Notice that between the [cardnumber] tag I am using a fake credit card number LinkPoint offers for testing. You can find more of these test credit card numbers in the PDF at http://www.firstdata.com/support/manuals_and_guides/pdf/global_gateway/n....

4. After using the above command I would get an error that I couldn't connect to the payment gateway until I got the SSL set up on my server. After SSL was set up I got another error. It said the following:

* About to connect() to secure.linkpt.net port 1129 (#0)
* Trying 208.72.248.102... connected
* Connected to secure.linkpt.net (208.72.248.102) port 1129 (#0)
* SSL: couldn't set callback!
* unable to use client certificate (no key found or wrong pass phrase?)
* Closing connection #0

After lots of whining and banging my head against the wall I re-read the thread on this page and notice I missed comment #18. WiseTex mention that you shouldn't put the PEM is the web accessible public_html directory. You should place the folder somewhere above the public_html directory. After doing that and revising the PEM location in the command line code everything worked!

Thanks again for this module!

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#23 Submitted on Tue, 05/12/2009 - 11:58 Top View page

maui1

Joined: 09/30/2008

Juice: 8

Hope you have found a solution. I installed Ubercart about a year ago and it seemed to be working fine with the Linkpoint gateway, After checking it recently I am confronted with the very same problem you reported here. I haven't upgraded Ubercart or changed the Linkpoint settings since first installing, perhaps the Linkpoint Gateway settings need changing.

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#24 Submitted on Thu, 06/11/2009 - 16:24 Top View page

jrust@drupal.org

Joined: 12/19/2007

Juice: 110

Great module, but I'm having trouble with declined transactions. Thought I'd cross-post this here in case anyone has developed a solution. The problem is that if someone's card is declined that order ID is now in Linkpoint's system and can't be used again. So, if the user were to click to click the Back button and change their CC# it would still not be able to process the order because it would detect a duplicate Order ID. So, my question is how would I reset the order ID after a declined transaction? Can I just increment it to the next available ID in uc_orders or is it also a session variable?

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#25 Submitted on Fri, 06/26/2009 - 13:19 Top View page

jrust@drupal.org

Joined: 12/19/2007

Juice: 110

Just a heads up that I solved the declined transaction problem mentioned above and posted the 6.x version as a module on d.o. at http://drupal.org/project/uc_linkpoint_api

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#26 Submitted on Sun, 07/05/2009 - 19:05 Top View page

le

Joined: 07/05/2009

Juice: 2

Hi - I'm having the same issue as someone else in this thread. I've got this module installed and got the PEM file, and it gives me a "success, your order is complete!" message after I check out, but the information isn't going into my First Data / Linkpoint transaction log. I can't debug curl from the command line (as suggested in other posts) due to SSH restrictions on the machine I'm working on, and there's no errors in my php error log. Does anyone have any ideas how I can debug this? Is there some debugging code I can add to the module itself? Any help would be GREATLY appreciated.

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#27 Submitted on Wed, 07/15/2009 - 23:14 Top View page

mcaden@drupal.org

Joined: 07/11/2009

Juice: 2

any idea on support for recurring billing?

I see nothing in any of the drupal controls for linkpoint allowing recurring subscriptions and nothing in the uc_recurring module allowing linkpoint.

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#28 Submitted on Sun, 09/13/2009 - 13:45 Top View page

avior@drupal.org

Joined: 08/30/2008

Juice: 7

I will be glade to hear what is the status of this ?
I this stable & working ?

does firstdata.com using this module as a payment gateway ?

Thanks
Avior

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#29 Submitted on Sun, 09/20/2009 - 22:09 Top View page

NewEditionFanClub

Joined: 09/20/2009

Juice: 2

I need recurring billing/subscription billing. Is it available with this?

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#30 Submitted on Thu, 10/08/2009 - 11:33 Top View page

Francois

Joined: 08/19/2008

Juice: 190

If you're wanting to add the First Data Global Gateway, this is the module you should use. There is also a version of UC2x at the Drupal site. http://drupal.org/project/uc_linkpoint_api

--------
'Twas the end of the world, and you didn't even know it.

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#31 Submitted on Mon, 11/02/2009 - 02:26 Top View page

awolfey

Joined: 07/13/2009

Juice: 10

Reply to http://www.ubercart.org/contrib/903#comment-38381

I want to add a couple of comments for others and for my own future reference.

Here: <path to your .pem file> you don't need the < and >, just the path/to/your/pemfile.pem

Here: <configfile>XXXXXXXX</configfile> you don't need to replace the XXX's for this test.

Here: <keyfile>/home/XXXXX/etc/linkpoint/XXXXXX.pem</keyfile > you DO need to replace the XXX's with your path and filename.

I continued to get this error after moving a site to a new server: curl: (58) unable to use client certificate (no key found or wrong pass phrase?)

It turned out the pem file had changed somehow during the transfer, and getting the pem again from First Data and pasting directly into the file in the command line editor fixed the problem.

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#32 Submitted on Fri, 11/13/2009 - 01:43 Top View page

quartarian

Joined: 11/12/2009

Juice: 4

First off, Id like to thank everyone for their work on this module.

I'm having an issue though getting it to work. My host is positive that port 1129 is not blocked and Ive verified the path to the PEM file a million times. Ive also had the host install an SSL certificate. When I try to process a card using either my production account or live account I get the default error:

"We were unable to process your credit card payment. Please verify your card details and try again. If the problem persists, contact us to complete your order."

Under recent log entries in drupal, I see a error of type "uc_linkpoint_api" with no message attached every time I try to process an order. Also, simultaneously during every order I get an error of type "uc_payment" with the message "Payment failed for order 8: Credit card payment declined: Sorry - Could not connect to payment gateway." Do you think my host is lying to me about port 1129? Is there anyway I can prove it if so? Thanks for the help!!

Edit:
Im using drupal 6.14, UC 2, and UC linkpoint API 6.x-1.2.

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#33 Submitted on Fri, 11/13/2009 - 20:40 Top View page

quartarian

Joined: 11/12/2009

Juice: 4

OK guys, after giving up and getting some sleep I found my problem! If you running on a windows server you need to make the path to the PEM file look something like this:
c:\\xammp\\keys\\xxxxxxxxxx.pem (notice the double slashes)

Also, I had to uncomment two lines in the module code:
curl_setopt ($ch, CURLOPT_SSL_VERIFYHOST, 0); //Comment out these two lines before actual use
curl_setopt ($ch, CURLOPT_SSL_VERIFYPEER, 0); //And this one.
According to the Magento plugin I found here, this is necessary for some people.

To debug the problem, I created a curltest.php file on my server with the following code (Notice the hard coded url):

<?php
$StoreID = "xxxxxxxxxx";
$PEMfilePath = "c:\\xammp\\keys\\xxxxxxxxxx.pem";
$xml = "<order>
    <billing>
        <userid>1</userid>
        <name>John Doe</name>
        <company></company>
        <address1>938 New Garden</address1>
        <address2></address2>
        <addrnum>938 New Garden</addrnum>
        <city>New York</city>
        <state>NY</state>
        <zip>10001</zip>
        <country>US</country>
        <phone></phone>
        <email>generic@email.com</email>
    </billing>
    <shipping>
        <name>John Doe</name>
        <address1>938 New Garden</address1>
        <address2></address2>
        <city>New York</city>
        <state>NY</state>
        <zip>10001</zip>
        <country>US</country>
    </shipping>
    <orderoptions>
        <result>GOOD</result>
        <ordertype>PREAUTH</ordertype>
    </orderoptions>
    <merchantinfo>
        <configfile>".$StoreID."</configfile>
        <keyfile>".$PEMfilePath."</keyfile>
    </merchantinfo>
    <creditcard>
        <cardnumber>4111111111111111</cardnumber>
        <cardexpmonth>1</cardexpmonth>
        <cardexpyear>12</cardexpyear> 
        <cvmvalue>111</cvmvalue>
        <cvmindicator></cvmindicator>
    </creditcard>
    <payment>
        <chargetotal>122.2</chargetotal>
    </payment>
    <transactiondetails>
        <transactionorigin>ECI</transactionorigin>
        <oid>3-13</oid>
        <invoice_number>3</invoice_number>
        <ip>127.0.0.1</ip>
    </transactiondetails>
    <notes>
        <comments>Pet Rock x4</comments>
    </notes>
</order>";
$xml = str_replace("&", "and", $xml);
$xml = str_replace("'", " ", $xml);
/*******************************************************************************
  * Start CURL Session
  ******************************************************************************/
  $ch = curl_init();
  $url = "https://staging.linkpt.net:1129";
  curl_setopt($ch, CURLOPT_URL, $url);
  curl_setopt($ch, CURLOPT_VERBOSE, 1);
  curl_setopt($ch, CURLOPT_POST, 1);
  curl_setopt($ch, CURLOPT_POSTFIELDS, $xml);
  curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
  curl_setopt($ch, CURLOPT_SSLCERT, $PEMfilePath);
  curl_setopt ($ch, CURLOPT_SSL_VERIFYHOST, 0); //Comment out these two lines before actual use
  curl_setopt ($ch, CURLOPT_SSL_VERIFYPEER, 0); //And this one.
  $buffer = curl_exec($ch);
  if ($error = curl_error($ch)) {
    echo $error;
  }
  curl_close($ch);
    echo $buffer;
?>

This is similar to what focal55 did but in a shared hosting friendly way. I hope this helps someone!

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#34 Submitted on Wed, 01/20/2010 - 00:50 Top View page

kensystem

Joined: 01/20/2010

Juice: 2

I had zero shipping and the XML send to the gateway has 'f' for the shipping value (I know this form the log file) when it should be zero ('f' presuably is first char of "free", and I had a "free" shipping item that triggered this error). Had to modify the line in class.linkpoint_api.php from
$xml .= "" . $pdata["shipping"] . ""

to:
$xml .= "" . ($pdata["shipping"]=='f'?'0':$pdata["shipping"]) . ""

Note this should also work for zencart and oscommerce...

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Ubercart

Linkpoint API Payment Module

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