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PayPal Express: Security Header error when testing the form.Asked by JenGetsShitDone on February 01, 2017 at 07:46 PM
I tried integrating PayPal Express into a form. I added my APIs and everything. When testing out the form I get an error that says Security Header for PayPal Express. I don't have an example to show you because I had to take it down to keep the form live.
The security header error usually occurs when the API Credentials are not correct. Can you please check and make sure that there are no extra characters or spaces in the API credentials? You can also generate a new one by following our guide here: How to Obtain PayPal API Credentials.
Also please make sure that you are using the Paypal business account and that the paypal integration is not in Sandbox Mode.
Please let us know if the issue persists.