Which file to install Paypal button?

[hara]

You do not need to add any code to use PPExpress....

Just enable and configure the Express module

admin > modules > payment > PayPal Express Checkout > install > enter your details

this will go to default button. I want to use selected button (I created 3 buttons for my three different sites).

Paypal tech support give me this code to replace:
<input type="hidden" name="lc" value="CN">

I'm not sure if I can edit it and how in:
includes\modules\payment\paypal.php

[DrByte]

Paypal tech support give me this code to replace:
<input type="hidden" name="lc" value="CN">

Zen Cart will set LC = CN automatically if your store is using CN as the currently-selected language.
There is no need to edit any code in Zen Cart.

[kobra]

this will go to default button

Paypal tech support give me this code to replace:
<input type="hidden" name="lc" value="CN">

First scrap that code -- as DrByte explained, it is not required

Next right click on the default image button and select properties.
Note the path and image name.

Rename your custom button EXACTLY the same as the default and upload it to the noted location.

Now your custom button will be displayed

[hara]

First scrap that code -- as DrByte explained, it is not required

Next right click on the default image button and select properties.
Note the path and image name.

Rename your custom button EXACTLY the same as the default and upload it to the noted location.

Now your custom button will be displayed

I can't. The button image is located in paypal server:
https://www.paypal.com/en_US/i/btn/b...ssCheckout.gif

[hara]

Zen Cart will set LC = CN automatically if your store is using CN as the currently-selected language.
There is no need to edit any code in Zen Cart.

I tried. Actually not. Paypal button doesn't follow Zen-cart charset setting.

[kobra]

Learn to right click & copy