This is a great question, and we are happy to say that we absolutely do not take pictures of credit cards.
GlossGenius uses an amazing piece of technology from a company called card.io which uses a phone's camera to scan the numbers on the card. It does not take a picture or save any information. The app simply reads the numbers, enters them onto the payment form, and closes the camera!
Card.io was acquired by PayPal many years ago and is therefore part of one of the most trusted payment platforms in the world. The GlossGenius app is completely secure! Security is very important to us and we are very careful with sensitive data.