PayPal PDT auth parameter

Question

I'm setting up PayPal PDT and IPN for a subscription/recurring payment button.

I'm using PayPal's documentation to explain the returned parameters, but one of them is not mentioned.

The auth parameter is ~87 characters long and looks like this:

AHJkv4ukrM7kwTPe7tt9Q.TPnHnUeQWJyNz4WQsMOKhYrZoaPknmceOp-G.voqTJ2V0ODJYC2u1maUdxl9-iBkg

What is this parameter? and how can I use it?

Answer 1

its probably a authentication string that validates the transaction between your site and paypal. From the looks of it, it doesn't seem like you can use it , its for paypal only.