within
preposition, adverb [ not gradable ] US /wɪθˈɪn, wɪð-/
inside or not beyond (a particular area, limit, or period of time):
Most Californians live within 20 miles of the coast.
The tickets should reach you within a week.
The company has always acted within the law (= legally).
Source: https://dictionary.cambridge.org/us/dictionary/english/within
13 Kasım 2018
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Corrections:
1. The service must have been provided no more than 30 days before the day that the insurance claim was filed. [Your sentence was confusing but I think you mean what I have written.]
2. We need to issue invoices within 30 days of providing services. GOOD
3. We need to issue invoices within 30 days from the day we provided a service.
13 Kasım 2018
1
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