Apple's iOS 8 lets third-party applications read fingerprint data via Touch ID. This would allow fingerprint-based login to be implemented into apps as an alternative the standard username and password. We have a feeling that developers of iOS apps requiring payment authorizations will be interested in the feature. Safety shouldn't be a concern as the user's fingerprint data will be stored safely inside the device's chip.
Feel free to check out the rest of our coverage on iOS 8 and its new features.