Add a funding source (OSAP, sponsor, etc.)

Go to Settings → "Funding sources" → "Manage funding sources" (or /settings/funding). Add a source with a Name (e.g. "OSAP", "Smith Family Scholarship"), a Kind (self-pay, loan, scholarship, employer, bursary, sponsor, grant) and optional contact details. Then pick it in the "Funding source" dropdown when creating an invoice (Accounts → New invoice).