No — no one has accessed your Split Pay account. We sent the notification because your password was detected in a data breach on another website. We're being proactive: even though your Split Pay account is fine, that password is no longer safe to use anywhere.
To reset your password:
Go to the Split Pay login screen and tap "Forgot Password"
Open the reset link we send to your email
Set a new password — make it different from what you use on other websites
That last part matters. If another site you use has a breach, a unique Split Pay password keeps your account safe. The notification will go away once you've updated to a new password.
If you have trouble resetting, contact support and we'll help.