How do I integrate Checkout with OpenCart?

Here's how:

Log in to your OpenCart admin panel.
Click the Puzzle Icon.
Click Extensions.
Select Payments (in the drop-down menu).
Select the + for PayPal Express Checkout (in the Payments Module list) to add this module.
Once the module has been added, click the Pencil icon to edit the module settings.
Configure the following fields:

Review additional options.
Click Save.
Click the Puzzle icon then click Extensions.
Select Modules from the drop-down menu.
Locate the Express Checkout module and click the Pencil icon.
Select Status > Enabled.
Click the Monitor icon and select Layouts.
Place a checkmark in the Checkout option then click the Pencil.
Select Content Top (Recommended) or any other placement option where you would like the Checkout button to be placed.
Select PayPal Express Checkout Button and click Save.

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