oData API - escaping single quotes in filter

Still working on building an app that integrates with Epicor’s API… Running into an issue when searching for an existing customer with a single quote in their name. Using GET Erp.BO.CustomerSvc/Customers?$filter=Name%20eq%20%27Testing%27%27s%20company%27 (un-url-encoded, that’s $filter=Name eq 'Testing''s company') and getting no results, even though several of the company exist in the system (because, well, testing) and show up fine in my quick search by customer name contains. Note the single quote in the name is escaped with another single quote. Not sure what we’re doing wrong.

In the meantime, the workaround I think I can use is $filter=indexof(Name, 'Testing''s company') eq 1