Combining output (deciles or risk score) of 2 or more logistic regression based model into one single output SCORE

I have 3 different datasets in which customer can or cant be present in all 3 datasets. I have built 3 models for all 3 datasets which are working fine. Kindly note, i cant make a make model combining all dataset together because not all customers would be present in all dataset due to which many variables would be null if any customer is present in the other 2 datasets.

Now, I need to create a single score for each customer by combining output of these 3 models. Output is currently in deciles. At the end, I should be able to use this combined single score to take decisions not individual model scores.

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