PayPal Set up problem

[ardhill]

Hi

I am trying to set up PayPal on my ZenCart and get this message when I click on the Checkout using PayPal button that appears on my shopping cart:

We are sorry for the inconvenience. The PayPal account authentication settings are not yet set up, or the API security information is incorrect. We are unable to complete your transaction. Please notify the store owner so they can correct this problem. (10002) 10002 Security error - Security header is not valid

Some details:
I haven't check out anything yet through the cart, it's - still under construction.
Zen Cart 1.3.8a
Database Patch Level: 1.3.8
I have just set up the Business PayPal account.
PayPal for website payments standard and express - not pro
I thought I had done all the bits right but obviously not, but have gotten my Credential API Signature details, IPN URL & return URL, Payment Data token and have ensured that Business ID field in the PayPal set up on the cart is exactly the PayPal e-mail address.

Any ideas what I have gotten wrong?

EDIT: I just put it into debug mode and have a bunch of e-mails with 'stuff' in them that don't mean much to me. Though this appears to be important "10002 Security error - Security header is not valid " whatever that means.

[DrByte]

10002 means that your API credentials are invalid.

Sometimes people think they need to use "sandbox" server instead of "live", but they fail to get sandbox API credentials instead for that purpose, which requires all the trouble of setting up sandbox account profiles, users, vendors, etc. So, don't use sandbox. Just use "live", and then you can use your API Signature credentials obtained from your live paypal account: http://www.zen-cart.com/getpaypal

https://www.zen-cart.com/tutorials/i...hp?article=319

[DrByte]

PayPal for website payments standard and express - not pro

DO NOT use *both* standard and express at the same time. If you do, then customers will see PayPal listed twice on the payment options page, and get confused. And, confusion results in abandoned carts.
If you're using Express, then remove Standard.

[ardhill]

Sometimes people think they need to use "sandbox" server instead of "live", but they fail to get sandbox API credentials

Many thanks DrByte, that was the problem.

DO NOT use *both* standard and express at the same time.

The standard seemed to install itself when I installed the express option on ZenCart - I think? Anyway I have now turned off the standard, though I didn't see 2 buttons, just the one.
I assume there aren't too many problems with setting up PayPal and Zen i.e. now I have turned off sandbox, it will just work right? My Express setting in Zen are:

Enable this Payment Module
True

Sort order of display.
50

Payment Zone
--none--

Set Order Status
Processing [2]

Set Unpaid Order Status
Pending [1]

Set Refund Order Status
Pending [1]

Express Checkout: Require Confirmed Address
No

Express Checkout: Select Cheapest Shipping Automatically
No

Express Checkout: Skip Payment Page
Yes

Express Checkout: Automatic Account Creation
No

Payment Action
Final Sale

Transaction Currency
Only GBP

PayPal Page Style
Primary

API Signature -- Username
payments_api1.MyDomainName.co.uk

API Signature -- Password
****************

API Signature -- Signature Code
xxxxxxxxxxxxx Real code not displayed xxxxxxxxxxxxxxxxxxx

PayPal Mode
PayPal

Live or Sandbox
live

Debug Mode
Off

Can I just check my understanding of those two variants please:

Express: When I am using the Zen Shopping cart, and just want people to be able to choose PayPal as one on the payment options.

Standard: When i want to use PayPal as my sole payment option.

[DrByte]

Can I just check my understanding of those two variants please:

Express: When I am using the Zen Shopping cart, and just want people to be able to choose PayPal as one on the payment options.

Standard: When i want to use PayPal as my sole payment option.

No.

Standard is PayPal's OLD archaic method of bolting on paypal handling to an ecommerce store without properly integrating it into its functionality. It was designed to merely add paypal to static html pages, but has been crudely adapted to work on database-driven sites. It works, but is NOT recommended.

Express is the newer more contemporary way to accept payments, and allows transactions to complete inline while the customer is present at your store, thus resulting in immediate activation of the customer's order.

[ardhill]

No.

Standard is PayPal's OLD archaic method ...

Thanks for the clarity.