Identity Provider (IDP)
The information about integrating BCSC login with the application can be found in the stack overflow thread given below:
GUID is Globally unique identifier and the identity partners we work with (IDIR and BCeID), make use of a SAML protocol. Accordingly certain user attributes are sent with a "payload" and one of those attributes is the GUID.
Please refer to the following stack overflow link for the similar question:
Personal BCeID is now being deprecated by the IDIM team; they discourage use of it and are actively trying to move teams using it to use BC Services Card