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Is it permissible to provide a service to a business which derives part of its income from selling pork?
At the same time, if the service provided is marketing where one would be expected to promote pork as part of an overall product portfolio. Is this allowed?
Is there an exception if the business agrees to pay for the service from non pork income?

Salamun Alaykum
You can provide your services to that organization as long as you do not directly promote the pork and the income you generate is Halal and you will consider your income that it is coming from non pork related items.