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You can also set all tenants for a customer. Unlike the more specific add or remove mutations this is useful if you are sycing tenants and customers with Plain.For this mutation you need the following permissions:
customer:edit
customerTenantMembership:create
customerTenantMembership:delete
Mutation
mutation setCustomerTenants($input: SetCustomerTenantsInput!) { setCustomerTenants(input: $input) { error { message type code fields { field message type } } }}