According to GDPR Article 4, personal data means…“any information relating to an identified or identifiable natural person (‘data subject’); an identifiable natural person is one who can be identified, directly or indirectly, in particular by reference to an identifier such as a name, an identification number, location data, an online identifier or to one or more factors specific to the physical, physiological, genetic, mental, economic, cultural or social identity of that natural person.”
Within your Pabau account, that would include your customers’ contact information. And they may at some point ask you to forget them, or modify their information to be accurate, etc. You would then be responsible for fulfilling that request.