2 ways for Buy now Licenses

It sounds like you could handle all of that with EDD and our Software Licensing extension: https://easydigitaldownloads.com/extensions/software-licensing/

The free version – can I hook the IPN post back and update 1 wp-usermeta field?

Doesn’t seem to me that this would be too complicated.

I can leave the other create a license key for later. That part isn’t selling much at this time.

Yes you can hook into the update payment process and update user meta during the edd_complete_purchase hook: https://github.com/easydigitaldownloads/Easy-Digital-Downloads/blob/master/includes/payments/actions.php#L92

I tried using this plugin but it interferes with 1 of my web services that I have running.

I deactivate Easy Digital Downloads plugin and my web service works.

Interferes in what kind of way? Does it throw an error of some kind?

My service won’t run. It is a restful JSONP service written in php

It returns a status of 200 but comes back with a parse error

$.ajax({
url: ‘HOST’,
crossDomain: true,
timeout: 10000,
data: { cipher_data : data },
dataType: ‘jsonp’,
success: function(data) { ruby_call(data.cipher_data); },
error: function(jqXHR, textStatus, errorThrown) {
ruby_call( ‘error:’ + textStatus + ‘:’ + jqXHR.status );
}});

https://localhost/wordpress/gkware_service.php?callback=jQuery1110031170443175375645_1397520861327&cipher_data=a46aa2eb519b60d6c5bd0086104a771157e038b1fb4dcf36f8399659dca74ab465051ed72716408caf806abe591e599a7096afb310d350a08c7e14509d511694fdfa11577631d3d25124ea12066e5d3fe5db31d8bcc8ae03a216c018201bcacfe060d43017dd3055e365e65dcc341b893303e9c8f01f80acd6ea6428b202d555&_=1397520861328

What’s the exact error?

That was the exact error that came from the web dialog.

It appears that I’m not able to perform a cross domain Ajax call to my web service when your plugin is activated. If I deactivate it and use the other paypal plugin and my 6 others everything is fine.

There is some incompatibility happening. Maybe rights or something.