Custom Order Status App? Custom Fulfillment Status App?

[eshopfu]

I am building a custom order/fulfillment status app and need to know where to focus.

What one is the most important?

1. Ability to create custom order statuses.
2. Email updates for order status changes.
1. Is email from your email address important?
3. Text updates for order status changes.
4. Check order status page on your store.
5. Ability to collect data from customers.
1. Ex: We are out of blue shirts, would you like red?
2. Ex: What text did you want printed on the shirt?
6. Scan QR code to move order from status to status.

What features am I missing?

What would you pay monthly?

Thanks!