How can I change the text (like title, message, and button labels) of the Pushwoosh Custom Subscription Popup using the Web SDK?

You can customise the popup's wording through the subscribePopup object in the Web SDK init call. There are three text parameters:

• text — the message shown in the popup;
• confirmSubscriptionButtonText — label of the "Subscribe" button;
• askLaterButtonText — label of the "Ask later" / dismiss button.

The popup has no separate title field and no "unsubscribe" button, so put your whole message into text.

Pushwoosh.push(['init', {
    logLevel: 'debug',                          // optional, for development
    applicationCode: 'XXXXX-XXXXX',
    safariWebsitePushID: 'web.com.example',     // if using legacy Safari push
    // ... other init options ...
    subscribePopup: {
        enable: true,
        text: 'Enable notifications to receive our latest updates and offers.',
        confirmSubscriptionButtonText: 'Yes, notify me',
        askLaterButtonText: 'No, thanks',
        manualToggle: false,   // true if you show the popup from your own code
        delay: 60,             // seconds between page load and popup appearance
        retryOffset: 604800,   // seconds before showing it again after "Ask later"
        theme: 'material',     // 'material' | 'topbar'
        position: 'top'        // 'top' | 'center' | 'bottom'
    }
}]);

Appearance is configured with the same object: iconUrl, iconAlt, overlay, bgColor, borderColor, boxShadow, textColor, textSize, textWeight, fontFamily, the subscribeBtn* and askLaterBtn* colour/weight/radius keys, mobileViewMargin and viewport. See the Custom Subscription Popup documentation for the complete list.

Note: the customPopup parameter and options such as titleText, messageText, subscribeButtonText, unsubscribeButtonText and cancelButtonText do not exist in the Web SDK and are ignored if present in your configuration.