Hello Susan,
An International Line of Credit is defined as a promise by a bank in one country to guarantee payment for goods originating from another country. Essentially, it's the mechanism a company uses in order to buy goods from foreign countries; it's basically a loan from the bank that a company must repay.
It has nothing to do with developing a product. There are no means for an individual (without significant collateral - in the hundreds of thousands of dollars range) to be approved for an ILC; it is a tool used by large, established companies to buy large ($100,000+ or even $1,000,000+) amounts of inventory. When you have a developed product, ready to be produced for market, a well-established company can be contracted to buy your manufactured product from an overseas producer (commonly using their international line of credit).
Regards,
Andrew