Wonga chief operating officer Niall Wass has urged the Archbishop of Canterbury, a critic of the firm, to try out the payday lender.
"What I'm asking him and others to do - go use the service. See if you think it's fair and transparent," he told ITV News Business Editor Laura Kuenssberg.
"Take out £10 for 30 days. Pay it back after a week - which you can't do in many other places. Look at the price, tell me if that's fair and transparent.
"And then judge us by our customers. Our customers are regular people."
More top news
It will become increasingly wet and windy across parts of Scotland and Northern Ireland across the next few days.
A police helicopter went on a 40-mile search after a 999 call about a cry for help - only to discover it was a goat and her kid.
A boy from Manchester was excluded from taking part in World Book Day for dressing at Fifty Shades of Grey character.