OpenCart Payment gateway Intuit QuickBooks API Payment using OAuth2
Installations:
1. Go to o your store admin panel. Navigate to Extensions -> Extension installer.
2. Click on the upload button. A dialog box should open.
3. Locate the installation file of this extension(intuitquickbooksapi.ocmod.zip) and select it.
4. Now this module should be visible in Extensions -> Extensions->Payments->Intuit QuickBooks API Payment
After locating it in the payment methods list just click the install button (“ + ” sign)
Then edit this installed payment method and configure it.Make sure Redirect URI is added in your Intuit QuickBook account.
Provide Client ID and Client Secret. Then click on "Save & generate Refresh Token" button.
5. Done