4Seller support authorize UPS, which can help seller fulfill orders easily and conveniently.
Step 1: Get the Billing Account Number
Log in UPS account--Profile Dashboard--Wallet--Get the billing number
Step 2: Setting--Order & Shipping --Shipping Carriers--Carriers--US--UPS
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Fill custome name and billing number
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Step 3: After successful authorization, it will appear under Authorized Logistics Providers. You can check the authorization status. If it shows as inactive, click Reauthorize. You can also configure the logistics channel.
If you have any further questions or suggestions, please do not hesitate to contact our support team.