I wonder about the business model. This isn't win-win - the courier companies lose. It would be better for them if you didn't exist. Presumably they remain competitive by passing the savings from unclaimed losses on to their customers in their pricing. So the more successful you are, the worse it is for their margins and/or for general courier pricing; yet your income relies on their existence and the current difficulty of getting a claim through.

Will this cause you problems? Will your success cause the pain that you are solving to disappear, thus putting you out of business? Do you have arrangements with them, and permission to scrape their site / use their API on your customers' behalf?