Where a construction contract contains a facultative service clause (permitting but not mandating particular methods of service), service of a payment claim on a project manager's representative with delegated authority under the contract constitutes valid service on the principal, even if the email to the principal's designated representative bounces back. A contractual 'valuation certificate' that meets the requirements of s 69 of the BIF Act constitutes a 'payment schedule', engaging the contractual time period under s 76(1)(a) rather than the statutory 15 business day period. The phrase 'excluding GST' in a claim means the claim is for the stated sum only, and GST cannot be added without amendment.
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