Validating ABNs, Australian Phone Numbers and Addresses in Intake Automations

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Intake and invoicing automations for Australian businesses often fail because of bad data in three fields: the ABN, phone number and address. The article recommends validating these fields at the point of entry rather than cleaning them up later. An ABN is well formed if it has 11 digits and its checksum divides evenly by 89, though a valid checksum does not confirm active business status, which requires checking the official ABN Lookup service. Phone numbers can arrive in several formats and should be normalised to a single E.164 form, with a maintained library such as phonenumbers recommended for complex cases. When a field fails validation, the enquiry should be flagged for human review rather than rejected, since losing a lead costs more than handling messy data.

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