CiviCRM Community Forums (archive)

I am trying to integrate PayPal Express to process event fees. I keep getting errors of invalid ReturnURL and CancelURL. It seem the API is only sending everything that comes after the base URL for these values.

For example the return URL should be:
https://example.org/?page=CiviCRM&q=civicrm/event/register&page_id=80&_qf_Register_display=1&qfKey=0a2319a130b6cd139bfc6caaf079d96c_4001
but it is only sending:
?page=CiviCRM&q=civicrm/event/register&page_id=80&_qf_Register_display=1&qfKey=0a2319a130b6cd139bfc6caaf079d96c_4001

It's a new install of the latest Civi version on a Wordpress site. Doing a little research, it seems that Paypal expects the base url to end with a backslash, but the wordpress settings keep deleting this when I try to change it. I'm pretty lost and a little out of my league here, but that is my best hunch.