"Rtp Hello Digit" is associated with Digit; "... A company that automatically and intelligently allocates money towards your savings goals ensuring personalized and steady progress towards financial health..."
When you make a withdraw from your DIGIT account, you are depositing money previously saved by the app back into whatever account you linked it to. In the linked account, the deposit shows up as being made by "Rtp Hello Digit".
*Awesome and pretty unique algorithm that adjusts the amount of money transferred from your linked account into a stand alone savings based on your real-time purchases and past spending habits. Been using it for a few years now (Android), zero issues. Check em out-