Plain vanilla integration with the OIDC Provider from BankID is to connect the OIDC client directly to the OIDC provider from BankID and use the default user-experience offered by the OIDC Provider from BankID. For such integrations there is no need to understand message flow details. For more advanced integration scenarios involving any intermediate service between the OIDC Client and the OIDC Provider from BankID and/or customization of the default user-experience, a closer understand of the message flow is required. The following sections address such issues: