Update Existing App Flutter Woocomerce

We're looking to update our existing hybrid app, built on the Flutter framework, for both Android and iOS platforms. The app is built on top of Woocommerce as its base and uses Weclapp via an API to calculate prices using a plugin. This plugin uses algorithms to calculate the price based on the quantity and type of items in the customer's cart. Please note that C items are only available when A or B items are present in the shopping cart. We want to ensure that these new features are seamlessly integrated into the app's existing functionality and that the app remains user-friendly and intuitive.

We are currently in the process of developing the graphic design for the app, and the programming should be oriented accordingly.

We would like to emphasize that this update should not require the creation of a new app, but rather should be built on top of the existing build.

Here's a breakdown of the specific features we would like to see included in this update:

I. Display of Ending Offers

-Display all offers that will soon expire
-Implement in a dedicated category or through a banner/pop-up window
-Push notifications for soon-to-end offers
-Notification history for past push notifications

II. Quantity Changes
-Represent quantity changes through a pen icon
-Add hints to the respective text fields

III. Explanatory Video
-Embed explanatory video during registration

IV. Article Search Function
-Add a search function for specific products or categories

V. Comment Field
-Add a comment field for orders

VI. Registration

-Implement a new registration design
-Display password and new password requirements during registration
-Request "trade registration" during the registration process
-Allow users to indicate their preferred language during registration (German or English)

VII. Onboarding Process
-Develop an onboarding process that familiarizes users with the app's functionality
-Include interactive tutorials and prompts to guide users through the app's features
VIII. My Account

-Allow customers to request a change of address with us via a button and a pre-filled email
-Require customers to provide and update their phone numbers
-Implement WhatsApp support during registration and sign-up
-Allow users to switch between German and English in their account settings

IX. Extended Plugin Updates

-Work with the A, B, and C articles and the corresponding fields that have already been created
-Make C articles only available when A or B articles have been selected, and display a message indicating that C articles are locked until A or B articles have been selected

X. Best Price Function Cross & Upsell Functions

-Display the next discount level in the fields and use it for upsells
-Add a "best price function" button to optimize offers by adding a larger quantity and reducing the unit price
-Include upsell and cross-sell notifications in the shopping cart view or during the checkout process


XI. New Guest Feature

-Allow new customers to browse the product catalog immediately after downloading the app
-Trigger the order only after the account has been matched by Weclapp

XII. DSGVO

-Integrate comprehensive DSGVO and privacy policies into the app
-Allow users to accept or opt-out of privacy policies
-Allow users to receive a copy of their personal data via email
-Protect user data through stricter password requirements