Modifying checkout page

[Jaycy]

Hi, I'm new to creating Shopify apps but is there a way to modify the checkout page in the following ways?

1) Shipping options - Display shipping rates that include a text with something like "$29.40 shipping + $12.52 tax and duty" (we will provide custom rates).

2) Extra charges line - Change "Taxes" line to "Duties and Taxes" or add a new line item under "Taxes".

I've looked through the Shipping and Fulfillment & Order APIs but can't seem to find the relevant sections to do this. Any help would be appreciated.

Thanks,

Jaycy

[Perennial]

Please share a store url better assist 

[Jaycy]

I do not have one yet as I'm currently checking if it's even feasible or not.

Thanks.

[vix]

Hi @Jaycy There are a few similar apps on the app store. I'd suggest looking into them to better understand what information they are able to update. It sounds like you would want to send custom information through the Carrier Service API : https://help.shopify.com/en/api/reference/shipping-and-fulfillment/carrierservice

In general, you are not able to update fields on the checkout. In this case, you would be in control of the shipping options presented to the customer with your added text within that box.