GetGroupIDByName lists all accessible groups and returns the ID of the group that matches a part of the provided name; i.e.

GetProjectIDs returns a list of all project IDs.

GetUserIDByEmail returns a user ID by email address.

GetVaribleGroupsIDByPattern returns a list of variable group IDs that match a pattern; the pattern is case-insensitive and can be a part of the variable group name, thus "varG", "VaRGroup", "My Variable Group" are matched by a pattern "var".

checks if the required environment variables are set and initializes the singleton instance.

SendRequest constructs and sends a request to the Azure DevOps API; can be used in case of a missing endpoint implementation in the Azure DevOps Go SDK.

SetRoleAssignment sets a role assignment for a variable group.

Structure that holds the credentials.