diff --git a/modules/ppcp-applepay/resources/js/ApplepayButton.js b/modules/ppcp-applepay/resources/js/ApplepayButton.js
index 89634747a..ef94197e0 100644
--- a/modules/ppcp-applepay/resources/js/ApplepayButton.js
+++ b/modules/ppcp-applepay/resources/js/ApplepayButton.js
@@ -220,7 +220,7 @@ class ApplePayButton extends PaymentButton {
 	registerValidationRules( invalidIf, validIf ) {
 		invalidIf(
 			() =>
-				[ 'TEST', 'PRODUCTION' ].includes(
+				! [ 'TEST', 'PRODUCTION' ].includes(
 					this.buttonConfig.environment
 				),
 			`Invalid environment: ${ this.buttonConfig.environment }`
diff --git a/modules/ppcp-button/resources/js/modules/Renderer/PaymentButton.js b/modules/ppcp-button/resources/js/modules/Renderer/PaymentButton.js
index 35d938b34..aa6b80301 100644
--- a/modules/ppcp-button/resources/js/modules/Renderer/PaymentButton.js
+++ b/modules/ppcp-button/resources/js/modules/Renderer/PaymentButton.js
@@ -683,6 +683,7 @@ export default class PaymentButton {
 	 * @param {(condition: () => boolean, errorMessage: string) => void} invalidIf - Registers a validation step that fails if the condition returns true.
 	 * @param {(condition: () => boolean) => void}                       validIf   - Registers a validation step that passes if the condition returns true.
 	 */
+	// eslint-disable-next-line no-unused-vars
 	registerValidationRules( invalidIf, validIf ) {}
 
 	/**
diff --git a/modules/ppcp-googlepay/resources/js/GooglepayButton.js b/modules/ppcp-googlepay/resources/js/GooglepayButton.js
index 0cd2bab70..83416b149 100644
--- a/modules/ppcp-googlepay/resources/js/GooglepayButton.js
+++ b/modules/ppcp-googlepay/resources/js/GooglepayButton.js
@@ -218,7 +218,7 @@ class GooglepayButton extends PaymentButton {
 	registerValidationRules( invalidIf, validIf ) {
 		invalidIf(
 			() =>
-				[ 'TEST', 'PRODUCTION' ].includes(
+				! [ 'TEST', 'PRODUCTION' ].includes(
 					this.buttonConfig.environment
 				),
 			`Invalid environment: ${ this.buttonConfig.environment }`