This is the part II of a two-part work started in {[}18]. In part I, Cardy algebras were studied, a notion which arises from the classification of genus-0, 1 open closed rational conformal field theories. In this part, we prove that a Cardy algebra also satisfies the higher genus factorisation and modular-invariance properties formulated in {[}7] in terms of the notion of a solution to the sewing constraints. We present the proof by showing that the latter notion, which is defined as a monoidal natural transformation, can be expressed in terms of generators and relations, which correspond exactly to the defining data and axioms of a Cardy algebra. (C) 2014 Elsevier Inc. All rights reserved