adding payment method error on paypal

[mr_typo3worker]

I'm testing the payment methods. And have all information included for PayPal Express. After checking all the credentials for typos or spaces, etc. still ending up with the error:

I,m not in sandbox mode, and the account is active. So I do not see why it would not work.
Any suggestions to look at?

Or any advice on including a payment provider which offers all payment option including paypall and dutch ideal/wero?

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2026-05-03 08:54:46	core/service/paypalexpress	4	PayPal Express: method = Aimeos\MShop\Service\Provider\Payment\PayPalExpress::process, order ID = 6, response = Array

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    PayPal Expres: Requist for order ID "6" failed with "Security error"

[aimeos]

Make sure, you use the old NVP API your PayPal account.

Common causes of PayPal "Security error" are:

• Wrong API credentials — The paypalexpress.ApiUsername, paypalexpress.ApiPassword, or paypalexpress.ApiSignature configured in the service item are incorrect or expired. This is the #1 cause.

• Sandbox vs. Production mismatch — You're using sandbox API credentials but pointing to the production endpoint (https://api-3t.paypal.com/nvp), or vice versa. For sandbox, the endpoint should be https://api-3t.sandbox.paypal.com/nvp (configured via paypalexpress.ApiEndpoint).

• API credentials not enabled — The PayPal account doesn't have NVP/SOAP API access enabled. You need to generate API credentials in PayPal under Profile → My selling tools → API access.