Update shipping rate of an active checkout through the use of my custom app

[zaryabdaha]

How do I update the shipping rate of an active checkout through my custom app whenever the user adds a discount voucher?
I've used the webhook to trigger the function whenever the user adds a discount voucher but I don't know how to update the data back on the Shopify store

[Liam]

Hi Zaryabdaha,

I believe you'll need to do the following: 

• Start by using the orderEditBegin mutation and create a caclulatedOrder object.
• Use the orderEditUpdateShippingLine mutation to update the existing shipping line.
• Finally use the orderEditCommit mutation to commit the changes. 

Hope this helps!