I have created an account on PayPal sandbox and configured the API/Integration Settings to use the appropriate username, password and signature with a Magento 1.12 EE instance on my local server. This worked fine and now, I tried removing (emptying) the credentials and updating them again with the same values and now, on the frontend I am receiving the following error.
PayPal gateway has rejected request. Security header is not valid (#10002: Security error).
As per some of the forum posts, I have cleared cache, logged out and logged backed in to Magento and I have tried the same credentials and I am receiving the above error.
Any help regarding this would be helpful.
For your reference,
- Sandbox mode is set to Yes
- API uses proxy is set to No