Create Nexus Locations

<span class="plan-badge plan-badge--pro">Available on Pro and Enterprise Plans</span> Records one or more physical locations for a merchant. A merchant's physical locations are what establish its nexus, and nexus is what decides whether a sale is sourced at its origin or its destination, so this is the data a self-managed cart calculation depends on. Each address is geocoded as it is written, and the normalized result is what every response returns; expect the address you get back to differ from the one you sent. If any address in the request cannot be resolved to a US state the whole request is rejected with 422 and nothing is stored, so a retry cannot duplicate the locations that would otherwise have succeeded. Address resolution for the whole request is budgeted at 10 seconds. A batch that exceeds it returns 504 and stores nothing; send fewer locations per call if you hit this. Geocoding that had already completed is still billed, because the lookups were still performed. Available to self-managed merchants only. A TaxCloud-connected merchant's nexus is held in TaxCloud, so this returns 403 for them.