While magnetically mediated Cooper pairing is the conjectured basis of heavy-fermion superconductivity, no direct verication exists. In this talk, I will demonstrate how one can use the heavy-fermion band structure derived from quasiparticle interference (QPI) imaging to determine the momentum-space structure of the f-electron magnetic interac- tions in the heavy fermion material CeCoIn₅. Solving the superconducting gap equations on its two heavy-fermion bands with the hypothesis that these interactions mediate the Cooper pairing, yields a series of quantitative predictions about the superconductive state, such as the momentum structure of the superconducting gap, T_C, phase sensitive QPI, the position of the magnetic resonance, and the spin-pattice relaxation rate. The agreement between these diverse predictions and the measured characteristics of superconducting CeCoIn₅ provides strong and direct evidence that its Cooper pairing is mediated by the f-electron magnetism.