Moved additional payment methods into beta

ref ENG-812
ref https://linear.app/tryghost/issue/ENG-812

We want to roll this out as a beta feature

apps/admin-x-settings/src/components/settings/advanced/labs/AlphaFeatures.tsx

@@ -59,10 +59,6 @@ const features = [{
     title: 'NestJS Playground',
     description: 'Wires up the Ghost NestJS App to the Admin API',
     flag: 'NestPlayground'
-},{
-    title: 'Additional payment methods',
-    description: 'Adds support for additional payment methods in Stripe Checkout',
-    flag: 'additionalPaymentMethods'
 }];
 
 const AlphaFeatures: React.FC = () => {

apps/admin-x-settings/src/components/settings/advanced/labs/BetaFeatures.tsx

@@ -15,6 +15,10 @@ const BetaFeatures: React.FC = () => {
 
     return (
         <List titleSeparator={false}>
+            <LabItem
+                action={<FeatureToggle flag="additionalPaymentMethods" />}
+                detail={<>Enable support for PayPal, iDEAL, WeChat Pay and others. <a className='text-green' href="https://ghost.org/help/payment-methods" rel="noopener noreferrer" target="_blank">Learn more &rarr;</a></>}
+                title='Additional payment methods' />
             <LabItem
                 action={<FeatureToggle flag='i18n' />}
                 detail={<>Translate your membership flows into your publication language (<a className='text-green' href="https://github.com/TryGhost/Ghost/tree/main/ghost/i18n/locales" rel="noopener noreferrer" target="_blank">supported languages</a>). Don’t see yours? <a className='text-green' href="https://forum.ghost.org/t/help-translate-ghost-beta/37461" rel="noopener noreferrer" target="_blank">Get involved</a></>}

ghost/core/core/shared/labs.js

@@ -30,13 +30,13 @@ const GA_FEATURES = [
 // NOTE: this allowlist is meant to be used to filter out any unexpected
 //       input for the "labs" setting value
 const BETA_FEATURES = [
+    'additionalPaymentMethods',
     'i18n',
     'activitypub',
     'webmentions'
 ];
 
 const ALPHA_FEATURES = [
-    'additionalPaymentMethods',
     'NestPlayground',
     'urlCache',
     'lexicalMultiplayer',