So you want PayPal Express Checkout on Magento 1.3?

And you get some weird errors…
open your app/code/core/Mage/Paypal/Model/Api/Nvp.php file and search for SOLUTIONTYPE, change its value to “mark”.

Edit your PayPal preferences from Magento backend and use this PayPal Url:

You should be done.
Good luck.

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