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Whenever a Loan Type is accepted or returned by the Payitoff API, it can be either in a complex object, with a `code` and `description` property, or it may be a `string` representation of just the `code` or `description`. All possible `code: description` mappings are shown below.

**CL** — FFEL Consolidation **D0** — Direct Stafford Subsidized (SULA Eligible) **D1** — Direct Stafford Subsidized **D2** — Direct Stafford Unsubsidized **D3** — Direct PLUS for Graduate/Professional **D4** — Direct PLUS Parent **D5** — Direct Consolidation Unsubsidized **D6** — Direct Consolidation Subsidized **D7** — Direct Consolidation PLUS **D8** — Direct Unsubsidized (TEACH) **D9** — Direct Consolidation Subsidized (SULA Eligible) **DU** — National Defense **EU** — Perkins Expanded Lending **FI** — Federally Insured Student (FISL) **GB** — FFEL PLUS for Graduate/Professional **IC** — Income-Contingent (ICL) **NU** — National Direct Student (NDSL) **PL** — FFEL PLUS Parent **PU** — Federal Perkins **RF** — FFEL Refinanced **SF** — FFEL Stafford Subsidized **SL** — Supplemental (SLS) **SU** — FFEL Stafford Unsubsidized **XP** — Private