I am using IP-1.4.10.
When I or a client goes to the Guest UR (e.g: https://invoice.******.co.uk/index.php/guest/view/invoice/idb6ooKydc0S0cv) and click the pay now button, the following message appears just below the “pay now” button:
" Username/Password is incorrect "
How do i fix this?
I assume that the PayPal credentials are not correct.
Also, please update to version 1.5 as it includes security updates also for online payments.
I have recreated my PayPal API credentials and now when i click the “pay now” button I get a different message, which is:
“Security header is not valid”
I have now fixed my problem.
This post saved the day: Error: Security header is not valid
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