Hi @cdub5000,
Thank you for posting on the forum.
This is the common error which occurs when either your API details are wrong or you have it in Sandbox mode using live API details Or in Live mode using Sandbox API details so please make sure it's correct as described in the following replies.
https://wordpress.org/support/topic/cannot-connect-to-paypal-error-10002?replies=3#post-4970080
http://premium.wpmudev.org/forums/topic/10002-e28093-security-error-e28093-security-header-is-not-valid#post-198286
Best Regards,
Vinod Dalvi