Never turn down an order from a customer. Hashem is showing you success—make bigger vessels.

If you don't fill their order, they may go elsewhere, and you could lose the customer permanently. Partnering with ... is a good idea, but make sure to discuss and write down all the details—not because of suspicion, G-d forbid, but so that you can feel at peace in your heart. https://www.torahrecordings.com/rebbe/igroskodesh/011/010/3678