Magnetic stripe data emulation rate adjustment based on swipe speed

A proxy payment card comprising:

• a substrate having:
• a memory storing magnetic stripe data associated with a payment card;
• a first sensor that detects a start of a swipe of the proxy payment card through a magnetic stripe reader;
• a second sensor that samples a speed at which the proxy payment card is swiped through the magnetic stripe reader and outputs a swipe speed, the second sensor being triggered into operation by a signal indicating the start of the swipe;
• a processor coupled to the memory and the first and second sensors, the processor being configured to:
• receive a signal from the first sensor indicating the start of the swipe;
• in response to receiving the signal,
• read magnetic stripe data from the memory, and
• generate electrical signals corresponding to the magnetic stripe data;
• and
• a magnetic stripe emulator connected to the processor and configured to:
• receive the electrical signals from the processor, and
• in response to receiving the electrical signals, generate a changing magnetic field readable by the magnetic stripe reader, the changing magnetic field encoding the magnetic stripe data for reading by the magnetic stripe reader during the swipe;
• the processor being further configured to:
• use the swipe speed output by the second sensor and the signal from the first sensor indicating the start of the swipe to iteratively adjust a rate at which the electrical signals are sent to the magnetic stripe emulator to cause the magnetic stripe emulator to adjust a rate of change of the magnetic field.