diff --git a/changelog.txt b/changelog.txt
index 6879bff12..1dea43cea 100644
--- a/changelog.txt
+++ b/changelog.txt
@@ -1,14 +1,14 @@
 *** Changelog ***
 
-= 1.9.1 - TBD =
+= 1.9.1 - 2022-07-25 =
 * Fix - ITEM_TOTAL_MISMATCH error when checking out with multiple products #721
 * Fix - Unable to purchase a product with Credit card button in pay for order page #718
 * Fix - Pay Later messaging only displayed when smart button is active on the same page #283
 * Fix - Pay Later messaging displayed for out of stock variable products or with no variation selected #667
 * Fix - Placeholders and card type detection not working for PayPal Card Processing (260) #685
-* Fix - PUI gateway is displayed with unsupported store currency #711 
+* Fix - PUI gateway is displayed with unsupported store currency #711
 * Fix - Wrong PUI locale sent causing error PAYMENT_SOURCE_CANNOT_BE_USED #741
-* Enhancement - Missing PayPal fee in WC order details for PUI purchase #714 
+* Enhancement - Missing PayPal fee in WC order details for PUI purchase #714
 * Enhancement - Skip loading of PUI js file on all pages where PUI gateway is not displayed #723
 * Enhancement - PUI feature capitalization not consistent #724
 
diff --git a/modules/ppcp-button/resources/js/button.js b/modules/ppcp-button/resources/js/button.js
index b64b5e9d8..4ec22c7d7 100644
--- a/modules/ppcp-button/resources/js/button.js
+++ b/modules/ppcp-button/resources/js/button.js
@@ -40,9 +40,36 @@ const bootstrap = () => {
             requiredFields.each((i, input) => {
                 jQuery(input).trigger('validate');
             });
-            if (jQuery('form.woocommerce-checkout .validate-required.woocommerce-invalid:visible').length) {
+            const invalidFields = Array.from(jQuery('form.woocommerce-checkout .validate-required.woocommerce-invalid:visible'));
+            if (invalidFields.length) {
+                const billingFieldsContainer = document.querySelector('.woocommerce-billing-fields');
+                const shippingFieldsContainer = document.querySelector('.woocommerce-shipping-fields');
+
+                const nameMessageMap = PayPalCommerceGateway.labels.error.required.elements;
+                const messages = invalidFields.map(el => {
+                    const name = el.querySelector('[name]')?.getAttribute('name');
+                    if (name && name in nameMessageMap) {
+                        return nameMessageMap[name];
+                    }
+                    let label = el.querySelector('label').textContent
+                        .replaceAll('*', '')
+                        .trim();
+                    if (billingFieldsContainer?.contains(el)) {
+                        label = PayPalCommerceGateway.labels.billing_field.replace('%s', label);
+                    }
+                    if (shippingFieldsContainer?.contains(el)) {
+                        label = PayPalCommerceGateway.labels.shipping_field.replace('%s', label);
+                    }
+                    return PayPalCommerceGateway.labels.error.required.field
+                        .replace('%s', `<strong>${label}</strong>`)
+                }).filter(s => s.length > 2);
+
                 errorHandler.clear();
-                errorHandler.message(PayPalCommerceGateway.labels.error.js_validation);
+                if (messages.length) {
+                    messages.forEach(s => errorHandler.message(s));
+                } else {
+                    errorHandler.message(PayPalCommerceGateway.labels.error.required.generic);
+                }
 
                 return actions.reject();
             }
@@ -85,7 +112,7 @@ const bootstrap = () => {
             PayPalCommerceGateway,
             renderer,
             messageRenderer,
-        );
+        );w
 
         singleProductBootstrap.init();
     }
diff --git a/modules/ppcp-button/src/Assets/SmartButton.php b/modules/ppcp-button/src/Assets/SmartButton.php
index fd465cfc2..ab6a30ffd 100644
--- a/modules/ppcp-button/src/Assets/SmartButton.php
+++ b/modules/ppcp-button/src/Assets/SmartButton.php
@@ -876,16 +876,31 @@ class SmartButton implements SmartButtonInterface {
 			),
 			'messages'                          => $this->message_values(),
 			'labels'                            => array(
-				'error' => array(
-					'generic'       => __(
+				'error'          => array(
+					'generic'  => __(
 						'Something went wrong. Please try again or choose another payment source.',
 						'woocommerce-paypal-payments'
 					),
-					'js_validation' => __(
-						'Required form fields are not filled or invalid.',
-						'woocommerce-paypal-payments'
+					'required' => array(
+						'generic'  => __(
+							'Required form fields are not filled.',
+							'woocommerce-paypal-payments'
+						),
+						// phpcs:ignore WordPress.WP.I18n
+						'field'    => __( '%s is a required field.', 'woocommerce' ),
+						'elements' => array(  // Map <form element name> => text for error messages.
+							'terms' => __(
+								'Please read and accept the terms and conditions to proceed with your order.',
+								// phpcs:ignore WordPress.WP.I18n.TextDomainMismatch
+								'woocommerce'
+							),
+						),
 					),
 				),
+				// phpcs:ignore WordPress.WP.I18n
+				'billing_field'  => _x( 'Billing %s', 'checkout-validation', 'woocommerce' ),
+				// phpcs:ignore WordPress.WP.I18n
+				'shipping_field' => _x( 'Shipping %s', 'checkout-validation', 'woocommerce' ),
 			),
 			'order_id'                          => 'pay-now' === $this->context() ? absint( $wp->query_vars['order-pay'] ) : 0,
 			'single_product_buttons_enabled'    => $this->settings->has( 'button_product_enabled' ) && $this->settings->get( 'button_product_enabled' ),
diff --git a/modules/ppcp-wc-gateway/src/Helper/PayUponInvoiceHelper.php b/modules/ppcp-wc-gateway/src/Helper/PayUponInvoiceHelper.php
index 32391bb0a..7789779d0 100644
--- a/modules/ppcp-wc-gateway/src/Helper/PayUponInvoiceHelper.php
+++ b/modules/ppcp-wc-gateway/src/Helper/PayUponInvoiceHelper.php
@@ -22,7 +22,7 @@ use WC_Product_Variation;
 class PayUponInvoiceHelper {
 
 	/**
-	 * Ensures date is valid and at least 18 years back.
+	 * Ensures date is valid, at least 18 years back and not older than 100 years.
 	 *
 	 * @param string $date The date.
 	 * @param string $format The date format.
@@ -43,6 +43,10 @@ class PayUponInvoiceHelper {
 			return false;
 		}
 
+		if ( $date_time < strtotime( '-100 years', time() ) ) {
+			return false;
+		}
+
 		return true;
 	}
 
diff --git a/tests/PHPUnit/WcGateway/Helper/PayUponInvoiceHelperTest.php b/tests/PHPUnit/WcGateway/Helper/PayUponInvoiceHelperTest.php
index 3a1d9bdc0..f470d25ea 100644
--- a/tests/PHPUnit/WcGateway/Helper/PayUponInvoiceHelperTest.php
+++ b/tests/PHPUnit/WcGateway/Helper/PayUponInvoiceHelperTest.php
@@ -26,6 +26,7 @@ class PayUponInvoiceHelperTest extends TestCase
 			['1942-02-31', false],
 			['01-01-1942', false],
 			['1942-01-01', true],
+			['0001-01-01', false],
 		];
 	}