A payment deadline with no consequence is a suggestion. Remedies give it teeth: interest that accrues on overdue amounts, and the right to stop work until the account is current.
If you are the provider, this is a cash-flow clause, not a legal nicety. Without it, Net 30 becomes Net 90 whenever the customer's finance team is busy, and you are financing their operations for free while still carrying payroll. If you are the buyer, the thing to check is scope: suspension over a genuinely disputed invoice can take out a service you depend on, so tie remedies to undisputed amounts and require notice first.
A balanced version is modest interest after a grace period, suspension only after written notice, and both limited to amounts that are not in good-faith dispute.
"Amounts not paid when due accrue interest at 1.5% per month. Provider may suspend the Services on ten (10) days' written notice if any undisputed amount remains unpaid more than thirty (30) days past due."
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Definitions and negotiation guidance here are educational business decision support, not legal advice. Consult an attorney about how any clause applies to your own agreement.