The goal of this paper is to propose an efficient operations-finance integrated decision framework for the manufacturers who face some financial challenges such as capital shortage, high cost of debt, and limited financing capacity. We developed a mixed-integer nonlinear model by extending the multi-product newsvendor problem to establish such a decision framework. To solve the proposed model, a three-phase approach is established based on the analytical analysis of the model features. In the first phase, an exact algorithm is proposed, which leads to a significant reduction in problem complexity. In the second phase, the financing capacity constraint is released and the rest of the problem is solved through KKT conditions. To handle the financing capacity constraint, two heuristics are proposed in the last phase which are efficient and easy to implement by practitioners. The results of the numerical analysis showed that in the presence of the financing capacity constraint, the firm should make integrated operations-finance decisions to prevent failure in business. Moreover, we found that even with an unlimited source of external financing, with the high cost of debt, the business fails according to the separate decision-making process. But, if the manufacturer makes its decisions based on the proposed integrated model in this paper, it can still stay competitive in such situations. Furthermore, the results of the performance evaluation of our solution approach captured its efficiency in solving large-scale problems in a short time.