Digital Receipt Photo Verification for Transaction Integrity
RCTClinical Trial
Self-reported financial data in mobile surveys often suffers from recall bias, misreporting, and deliberate fabrication by study participants seeking survey rewards.
Picture this
Requiring users to upload a clear photo of an official transaction receipt before earning reward points acts like a store register validation stamp, ensuring that reported numbers match verifiable paper records.
What the evidence says
The photo audit protocol enabled independent verification of transaction dates, recipient cellphone numbers, and currency values, supporting high data precision across 51,395 observation weeks.
- Who was studied
- N = 4,458 retained migrant workers logging remittance transactions in the UAE across 51,395 weekly app observations.
- How
- Gamified app-based reporting system where participants earned points toward redeemable gift vouchers (AED 25 per 100 points) specifically for remittance entries accompanied by verified transaction receipt photos containing recipient name, date, and currency amount.
What to do
Require smartphone app participants to upload photos of physical transaction receipts as a prerequisite for earning gamified survey completion incentives.
From the source
"Participants were asked to upload a photo of the transaction receipt showing all the above items so that the data can be verified. Records that included the receipt photo were awarded points."
A Field Experiment among Filipino Migrant Workers in the UAE.pdf