Receptor for TNFSF13/APRIL and TNFSF13B/TALL1/BAFF/BLYS that binds both ligands with similar high affinity. Mediates calcineurin- dependent activation of NF-AT, as well as activation of NF-kappa-B and AP-1. Involved in the stimulation of B- and T-cell function and the regulation of humoral immunity. {ECO:0000269|PubMed:10956646, ECO:0000269|PubMed:10973284}. This is the function of TNFRSF13B (TNF receptor superfamily member 13B, Ensembl gene identifier ENSG00000240505).