Shipping line error using checkout api in php

Hi , I am using Checkout API while working with this API I am getting this error response :

{"errors":{"shipping_line":{"base":[{"code":"invalid","message":"ist ungültig","options":{}}],"id":[{"code":"expired"," (truncated...)

Please anyone know about that what does this mean.

How do i fix this issue ?

Thanks in advance !

Hey @DSLR

Can you grab us the x-request-id from the response headers for this request?

Hi @Kevin_A , Thank you for your response !

Yes I have used Storefront Token for this request and then after I have create Checkout Api but still I am not able to change shipping price.

I have found Shopify checkout documentation where we have option to set shipping line price .

Is there another way where we have create custom shipping line ?

Please help me to achieve this.

Thanks !