Cash-strapped and in dire need of 30,000 naira (about $20), Mariam Ogundairo turned to a loan app, downloading it and registering her phone number. 

The money was quickly sent over but came with a 21.6 percent interest rate, due in two weeks. Like many in Nigeria, battered by inflation, Ogundairo was too broke to pay back what she owed.

Originally published on doc.afp.com, part of the BLOX Digital Content Exchange.