The input is the protein UniProt isoform ID. If the pdb-profiling works properly, SIFTS can map and filter the relavant complex PDB structures, and the PISA API can retrieve all protein interface residues. However, the relevant information about the complex is not being outputted, and we have discovered that this is due to the malfunctioning of the PISA API. What I need now is a way to bypass the step involving the PISA API and obtain all other results.