Quick Note, I also tried the Paypal variables going to the short name of the module text fields.
http://myurl/RetreatRegistration.as...ht_phone_a As well as reverse of the way I did it to send it to paypal in the first place.
http://myurl/RetreatRegistration.aspx?$("FirstN")=first_name&$("LastN")=last_name&$("Address")=address1&$("City")=city&$("Region")=state&$("PostalCode")=zip&$("Spouse")=os0&$("Email")=email&$("Phone")=night_phone_a
Neither of which worked. Is there a different varialble name that paypal is using that I should be setting this to? Is there another variable that needs to be set on the paypal side that is being set through the control to allow the post back?