Customize a flutter app. And integrate a payment processor

1. https://www.2checkout.com/
Integrate the 2Checkout payment processor

2. Personalization
I will have merchants Whoe Prices Change every day and it is very difficult to uble to update The Products One By Oney Day, So I Want To do The Following.

Customize So That the Merchant Can Place Their Products With A Price of 0 and Change Or Update The Price of The Products at The Time of Accepting the Order.

Example

Create New Name State (Negotiation)

1. WHEN A CUSTOMER PLACES AN ORDER THE MERCHANT UPDATES THE STATUS TO NEGOTITION AND IN THAT STATUS THE SELLER CAN EDIT THE COST OF EACH PRODUCT IN THE ORDER DETAILS AND UPDATE THE ORDER TO SHOW THE TOTAL ORDER.

2. WHEN THE SELLER UPDATES THE ORDER TO SHOW THE TOTAL OF THE INVOICE, THE CLIENTS APEVIVES TO NOTIFICATION SHOWING THE Result of The Invice, The Price of Each Product and the Total of the Order.

3. Two Buttons Should Be Added, Reject. and Accept

This Gives The Customer The Option to Accept Or Reject The Purchase Order.

if the customer clicks reject the Order is canceled
If the customer clicks accusch he will be redirected to the payment page. to proceed with the payment method and pay the Order.