Hi there! I understand you're trying to make a payment through the Applebee's app, but no matter the payment method you use, it keeps getting declined. Let's work through this together.

To get a clearer picture, could you tell me if you’re using a credit/debit card, Apple Pay, or another payment method? Also, are you trying to order through the Applebee's app specifically, or the website? Knowing this helps me tailor the steps better for you.

Meanwhile, here are some initial steps you can try to resolve payment declines in the Applebee’s app on your Windows device with WebKit browser:

1. Check Payment Information: Make sure all the card details you entered are correct and up to date, including the card number, expiration date, and CVV.

2. Verify Billing Address: Sometimes payment declines happen if the billing address entered does not match the one registered with your bank or card issuer.

3. Use a Different Payment Method: Try adding another card or using a payment option like PayPal or Apple Pay if available in your region.

4. Clear Browser Cache and Cookies: Since you're on Windows with WebKit, clearing your browser's cache and cookies can sometimes fix these issues:
- Go to your browser settings.
- Find the option to clear browsing data.
- Select cache and cookies, then clear them.
- Restart the browser and try again.

5. Ensure Internet Connection is Stable: A weak connection can sometimes cause transaction failures.

6. Update the App or Try Another Browser: If you're using the app on a device, check for updates. If on a browser, try a different one like Chrome or Firefox to see if the issue persists.

If you've already tried these or the problem continues, it might be worth checking if Applebee's is experiencing payment system issues or outages at the moment. Occasionally some users have reported multiple payment failures due to temporary system issues with Applebee's ordering platform1 10.

Could you please let me know which steps you’ve already taken? That way, I can help you with more detailed troubleshooting from there.