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Please fill all those fields to made working correctly to work with PayPal:

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Business Email : Email address of your business
Notify URL : PayPal Notify URL (example (http://yourServerName/ecommerce/control/payPalNotify)
Return URL : PayPal Return URL (example (http://yourServerName/ecommerce/control/orderhistory)
Cancel Return URL : PayPal Return On Cancel URL (example http://yourServerName/ecommerce/control/payPalCancel/main)
Image URL : Image To Use On PayPal (example (http://yourServerName/images/ofbiz_logo.gif)
Confirm Template : Thank-You / Confirm Order Template (example /order/emailconfirmation.ftl)
Redirect URL : PayPal Redirect URL (Sandbox http://www.sandbox.paypal.com/us/cgi-bin/webscr Production https://www.paypal.com/cgi-bin/webscr)
Confirm URL : PayPal Confirm URL (Sandbox https://www.sandbox.paypal.com/us/cgi-bin/webscr Production http://www.paypal.com/cgi-bin/webscr)

Once PayPal Payment Gateway has been configurated you have to go to Catalog - Stores - select your Store - Payments tab

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Edit the Payment Method Type Paypal and choose as Payment Gateway Config Id "PayPal Config".
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As deprecated use you can alternatively change the configuration parameters into

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