Update composer.json

Author: remcotolsma

composer.json

@@ -97,7 +97,7 @@
 		"wp-pay-gateways/omnikassa-2": "^4.7",
 		"wp-pay-gateways/pay-nl": "^4.5",
 		"wp-pay-gateways/paypal": "^2.3",
-		"wp-pay/core": "^4.19",
+		"wp-pay/core": "^4.20",
 		"wp-pay/fundraising": "^3.2"
 	},
 	"require-dev": {