The details as outlined on the eBay sign up page for this app are confusing and appear to be contradicting:
Webstore
Get an online store with all your eBay items in seconds - $5.99 per month.
Pricing details
Free Trial * (Usage fees may apply during the free trial)
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7 Days
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Usage fee
$5.99 per month. 7 Days 100% FREE trial.
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What are the "Usage Fees [that] may apply during the free trial"?