As a SaaS platform, do we need to link our clients' adwords IDs under our Production Manager account for API access to work?`

We have an application that will pull in data about campaign performance, CTA, CPC, etc. This will only require read-only access. 

We have built the application and obtained basic access after successfully completing the submission. However, we are facing this peculiar issue. How do we gain access to get a 3rd party's metrics through the API and developer token without linking them to our production manager account? 

We end up losing customers because we request for their adwords ids and manually add them to make sure the application works. Is there a way around this?

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