Custom tax calculations

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We've got a client looking to use Shopify as the front-end to their longstanding ERP.   In their use case, customers have multiple addresses, some of which are tax exempt for reasons controlled by them manually.   They want to use a tax automation platform, but have the ERP tax rules for their customer address used for exemptions.

Is there a way to customize Shopify so that checkout tax calculations can be intercepted with new logic, ideally alongside an Avalara or Taxjar integration?

Thanks in advance!


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