The phrase "refundable amount" refers to the money that can be returned to you if you decide not to proceed with a purchase or if you return a product or service. It means that you can get your money back. Full definition
Datsun has already started taking bookings for Go + with a fully refundable amount of Rs. 11,000. (cardekho.com)
If you paid no taxes during the year and owe no taxes, but are eligible for one or more refundable tax credits, you will also receive a refund equal to the refundable amount of the credits. (smartasset.com)
In some cases, the miner fees required to send a refund are higher than the refundable amount. (blog.bitpay.com)