How can i create a custom customer portal?

Hi, I am developing an application to manage orders and want it have a custom customer portal.

Some of the things i need are:

Change order status by default values. whit a dropbox o select componet

also when the status change a push notification is send to a specific user.

For example: if a admin change de status of the order to "Shipped" a push notification is sent to the user that performed the order.

Can I do this?
If i can, how can edit the data of customer portal?

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