Payment error: Security header is not valid

NeoGen
Contributor
Contributor

We just created a professional version of our website and PayPal was processing fine during development.  We moved the site into a sandbox to work on a few issues and updates, and PayPal stopped processing.  I figured it was due to the url change so did not worry too much about it.  We transfer the site back to the regular url and now I am getting this error code??  Any ideas?  The retail site we have is working just fine using the same API credentials as the pro-site.  We have a PayPal Pro account.  I noticed it was showing basic when I posted.

 

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