Updated over a week ago
Note: Not registered with UPS yet or do not know your developer credentials? See Shopify's Activate Shipping with UPS guide for how to register for an account with UPS and where to find your account number.
Adding your UPS credentials to Store Pickup + Delivery
Open Store Pickup + Delivery, head to the Rates Page, scroll down the page to the Shipping section and then select the Advanced Options
From the pop up modal select UPS
Check Enable UPS rates and enter your Username, Password, Account Number and API Key*.
*If you do not know your UPS API key, please go to the Developer Kit section of your UPS account or contact UPS for help.
Once entered simply Save and your UPS rates will be active via the shipping channel of the app!