Hi.Regarding the third-party calculated shipping rates, we would like to add for $20/month for now, see how it goes, and eventually switch to the annual billing. Please proceed with the monthly billing first. Thanks!
Hi @hiyotoko
You will need to contact Shopify Support to have them add it for you. They don't/can't see all postings in the community.
Try going here:
https://help.shopify.com/en/questions#/contact