Paypal Error 4020
Software Design Technical Web Development Languages, Tools and Technologies About Contact Ridge BLOG Home › Tech Stuff › Paypal PDT, Fail Error: 4020 Paypal PDT, Fail Error: 4020 There are a few reasons that could cause paypal to send back: FAIL ERROR: 4020 When you attempt to verify PDT transaction data by posting a _notify-synch command. However, in 9 times out of 10 the cause is due to the request containing an incorrect ‘at' or authorisation token argument. The ‘authorisation token', or ‘Identity Token' is a big long alphanumeric string, to find yours log into your paypal account, click on ‘Profile', then click on ‘Website Payment Preferences', scroll down to the ‘Payment Data Transfer' section - you will see your ‘Identity Token' at the end of this section. This token must be included in your _notify-synch command as an argument named ‘at'. Some more information on Paypal's PTD can be found here: https://www.paypal.com/us/cgi-bin/webscr?cmd=p/xcl/rec/pdt-techview-outside Related PostsPaypal - Accept Credit Card Payments, ‘Paypal Account Optional' not visibleGoogle App Engine - Paypal PDT ExampleGoogle App Engine & Paypal Talk Slides 0 0 1 COMMENT yousuf 5 years ago it helped me alot Thanks Kevin Reply LEAVE A REPLY Cancel reply Quick Contact Contact us to chat about how we can help you with your software needs info@ridgesolutions.ie 087 2236429 Search: Ridge Blog libpng - Changing compression level when writing PNG Image Raspberry Pi and GPS for Testing Camera Image Timestamps with NTP and PPS Image Processing with Intel's SSE SIMD instructions for 12-bit images Cross compiling libEXIF for ARM on Ubutnu Code to test u-blox Binary GPS Packet Checksum IEEE has C as top Programming Language in 2016 Friday - Programming in pure unadulterated C Today Contact Us: Address: 43 Churchgate, Wicklow, Co. Wicklow, Ireland. Telephone: +353 87 22
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Knowledge Base General/Misc. How-To Articles Troubleshooting Tips News/Updates Extensions/Hacks s2 Codex / Docs Class Packages API Functions API Hooks/Filters API Constants GPL v2 License Changelog (Unified) Contact A Human Prices/Licensing About About Us Pre-Sale FAQs Our Customers Terms & Conditions Support Policy Privacy Policy http://www.s2member.com/forums/topic/error-4020-on-paypal-pdt/ Home Old Forums (READ-ONLY): The community now lives at WP Sharks™. If you have an s2Member® Pro question, please use our new Support System. Error 4020 on Paypal PDT Home › Forums › Community Forum › Error 4020 on http://www.nonabyte.net/paypal-error-4020/ Paypal PDT This topic contains 19 replies, has 3 voices. Last updated by Jason (Lead Developer) 4 years, 3 months ago. Topic Author Topic Posted: Thursday Jul 5th, 2012 at 6:40 am #18369 Tim Parkin Username: timparkin I'm working paypal error on a new wordpress website and am using an existing paypal account with express checkout. I've set up the S2Member with auto return and PDT and IPN's seem to be working fine (I can see the results in the paypal-ipn.log showing correct responses). However, the return page shows the dissapointing grey screen informing me "Unable to verify $_POST vars". I've tried to dig into this a bit and have run the server php page which reports everything paypal error 4020 is OK. I have also exported the parameters sent to paypal so I can check the paypal return code. The params are .. {'tx': '59L86352N7049751A', 'cmd': '_notify-synch', 'at': 'EM--snipped--Yod-V04'} I've used a small python script to send the ssl request to paypal and paypal is returning a 4020 code suggesting that the PDT identity token is incorrect (as far as I can understand reading around about 4020) but I've checked the value in the ‘at' param key and it matches my PDT token. The only thing I can think is that when I started using S2Member, I also applied for a payments pro account and am wondering if there is something in ‘limbo' in paypal whilst this account is being approved? My test users are signing up OK as they end up being redirected back to the home page after getting the ‘unable to verify' message and, I presume, are just registering and the IPN sync is happening. Tim p.s. Python script used to check the connection is .. import urllib params = { 'tx': '59L86352N7049751A', 'cmd': '_notify-synch', 'at': 'EM--snipped--Yod-V04'} params = urllib.urlencode(params) f = urllib.urlopen("https://www.paypal.com/cgi-bin/webscr", params) print f.read() List Of Topic Replies Viewing 19 replies - 1 through 19 (of 19 total) Author Replies Author Replies Posted: Friday Jul 6th, 2012 at 7:07 am #18455 Cristián Lávaque Username: Cristian Hi Tim. What does your IPN log say about the tra
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