post https://apibeta.familysearch.org/platform/tree/persons//merges/
This method performs a person merge as specified by a Person ID (survivor) and Duplicate Person ID along with the list of resources to be merged. All resources from the survivor person that need to be deleted must be specified. All resources that should be copied from the duplicate person to the survivor must be specified. If a resource is copied and a resource of the same type already exists on the survivor then that resource must be deleted from the survivor.