PayPal gateway has rejected request. Security head

Question

up the pay-pal advance in magento . I have fill all the credentials in magento admin . BUt when i go to frontend and click pay-pal button it gives

PayPal gateway has rejected request. Security header is not valid (#10002: Security error

i have googled a lot and found some suggestions like

Remove API Username, API Password and API Signature from Admin->configuration->Paypal->API/Integration Settings. clear cache and test again

i have tried all these but it still gives the same error.

Please suggest me what can be the issue

Answer 1

The Security header is not valid error is only caused for two reasons:

1. Wrong credentials Make sure that you've put your API Username, API Password and API Signature correctly. Sometimes it happens that during copy and paste there is accidently a space added, this would trigger this error. Doublecheck this settings in the SDK or in the admin panel of your third party shopping cart.

2. Wrong Endpoint This error would come up if you send the data to the wrong endpoint. Make sure that you sending the live credentials and data to our live endpoint. When you want to test your store make sure that you use our test endpoint and the credentials from your sandbox test account. If you are using a third party shopping cart, make sure that your store is running in test or live mode, regarding which credentials you are using.

You can check for your credentials here too:

FOR LIVE

https://api-3t.paypal.com/nvp?&user=xxxxxxxxxx&pwd=xxxxxxxxxx&signature=xxxxxxxxxx&version=70.0&METHOD=SetExpressCheckout&RETURNURL=http://www.paypal.com/test.php&CANCELURL=http://www.paypal.com/test.php&PAYMENTACTION=Sale&AMT=50&CURRENCYCODE=USD

FOR SANDBOX

https://api-3t.sandbox.paypal.com/nvp?&user=xxxxxxxxxx&pwd=xxxxxxxxxx&signature=xxxxxxxxxx&version=70.0&METHOD=SetExpressCheckout&RETURNURL=http://www.paypal.com/test.php&CANCELURL=http://www.paypal.com/test.php&PAYMENTACTION=Sale&AMT=50&CURRENCYCODE=USD

Just Substitute the user, pwd and signature and enter in your browser. You should get ACK = SUCCESS if you have input your credentials correctly.

You can also get your credentials here : https://www.paypal.com/cgi-bin/webscr?cmd=_get-api-signature&generic-flow=true

Answer 2

If you are using PayPal Payments Advanced with Magento, you should be using your PayPal Manager credentials, and not your API Credentials.
This could be the reason you are getting Security Banner Header not valid 10002.
Here is the integration steps from Magento:
PayPal Advanced Integration with Magento

You need to setup Layout C in PayPal Manager PayPal Manager Login.
Make certain that you include your error URL, cancel URL, and Return URL. Magento is very good about telling you what URL you should be using.

After you have setup Layout C in PayPal Manager you need to use your Manager Credentials in Magento.
Just in case you need it, here is the information on setting up your Hosted Checkout Pages in PayPal Manager:
PayPal Hosted Checkout Pages

Here is the information on where to find your PayPal Manager credentials:

• Partner: Your PayPal Partner ID. Most direct Merchants have PayPal as the Partner
• Vendor: Your PayPal user login name. Also known as Merchant Login
• User: The ID of an additional user set up on your PayPal account. Same as Merchant login if you have not setup a separate user id in PayPal Manager.

Use your API Signature Credentials from your PayPal account for the Express Checkout setup.

Answer 3

Dont let the others fool you, they just type in stuff here they googled on the internet.

Look for the number you get here: https://developer.paypal.com/docs/classic/api/errors/

Because the information provided by these code is a delicate matter, they display this error message instead of you account is locked, account restricted, limit exceeded and so on.

Thats what they told me, at least.

We also get this code from time to time, after hundreds of paypal transactions, so wrong paypal credentials from the side of the shop owner is quite unlikely, isnt it? ;)

Answer 4

This error simply means your credentials are wrong. Please check with the credentials. If you are using sandbox then you are supposed to provide facilitator related credentials.

Answer 5

In my case everything seemed fine at Magento level. I asked client questions about PayPal, at which point they tried to login to the paypal.com site and were unable to (authentication failed). Account had been locked. Client was able to resolve with PayPal tech support directly, no Magento issue after all.

Answer 6

I got the same problem and found the problem is

• I type the API signature character by charter, the character "I" is similar to "l"
• As there are multiple "I" in the signature, I have to tested one by one via the link mentioned by Vimalnath.
• Then damn it, it works.

Therefore, copy is a better way while being careful about the spaces at the front or end.