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Integrated plugins use the product weight and dimensions to estimate shipping. It is NOT a perfect solution... USPS is the easiest to integrate because you do not need to have a USPS account. Both FedEx and UPS require you to have an account and provide other account information such as a signature key.
All shipping plugins require you to set up the shipping services you will offer during checkout such as Priority Mail, Overnight, etc.
The following pertains to how shipping will be calculated and charged to INTERNATIONAL customers during checkout. We recommend using an integrated plugin for international shipping. If you need to discuss options with us, please let us know.