Create Flutter App With Laravel Admin Dashboard

i am interested in creating an app for both Android and iOS that is similar to the Meih Yawmiyyi app. Meih Yawmiyyi is a platform that allows users to participate in a daily draw worth $100. Users can obtain tickets for the draw by completing different tasks such as watching advertising videos, answering questions, or completing tasks via social media. The winners of the draw are selected randomly through a mechanical process. You can check out their website at https://www.100yawmiyyi.com/en and download the app from the Google Play Store to see how it works.

Please provide information on the support and maintenance services that will be available after the completion of the app development project.