Systems and methods for using token application programming interfaces are disclosed. According to an embodiment, a method for using token programming interfaces may include: (1) receiving, at an eligibility application programming interface (API), a token or a Digital Primary Account Number (DPAN) for a financial instrument from a merchant or a payment facilitator backend; (2) calling, by the eligibility API, a Funding Primary Account Number (FPAN) lookup API with the token or DPAN; (3) receiving, by the eligibility API, the FPAN for the token or DPAN from the FPAN lookup API; (4) generating, by the eligibility API, an issuer reference identifier for the FPAN; (5) storing, by the eligibility API, a mapping between the FPAN and the issuer reference identifier; and (6) communicating, by the eligibility API and via the eligibility API, the issuer reference identifier to the merchant or the payment facilitator backend.