To resolve the issue of the Raising Cane's Chicken Fingers app not completing payment for your order, follow these step-by-step guidelines:

1. Check Your Internet Connection: Ensure your device has a stable internet connection. Try switching between Wi-Fi and mobile data.

2. Update the App: Go to the Google Play Store and check for any available updates for the Raising Cane's app. An outdated version might have bugs affecting payment processing.

3. Clear App Cache: Go to your device's settings and navigate to 'Apps'. Find Raising Cane's app, then select 'Storage', and choose 'Clear Cache'. This may resolve any temporary glitches.

4. Use Alternative Payment Methods: If you're experiencing issues with your primary card, consider adding your card to a digital wallet like Google Pay. Some users have reported success in completing payments using such services instead of directly inputting card details - learn more.

5. Check for Server Issues: Occasionally, the app may be down for maintenance or experiencing server issues. You can check social media or forums like Reddit for any reported outages.

6. Re-enter Payment Information: Go to the payment settings in the app and re-enter your card details to ensure everything is correct.

7. Contact Customer Support: If the problem persists, reach out to Raising Cane's customer service. You can find support contact details through their official website or the app itself.

8. Try Reinstalling the App: As a last resort, delete the app from your device and reinstall it from the Google Play Store. This can often fix persistent issues with app functionality.

Following these steps should help you resolve the payment issue on the Raising Cane's app. If problems continue, keeping track of any error messages encountered can help in troubleshooting further or when contacting support.