What's real: two things, checked separately. On Make's community forum, in your own words, you described roughly 80 recurring clients with invoices living as loose files across desktop, iCloud, and Google Drive, matched and emailed by hand. Separately, your own site, checked directly today, lists three branch offices, Torrance, West LA, and Mid-LA, with no client portal or billing-status page anywhere. The "no single view across branches" part is what I found looking at your site, not something you said on the forum, worth being precise about which is which.
What I'd be straight with you about: the version you originally asked about, just emailing PDFs automatically, is a smaller, cheaper task than what's below, and freelancers quoted that narrower piece around $120 to $650. What's shown here is a bigger step: a single searchable view of paid and outstanding status across all three branches, not just automated sending. Worth being clear about that difference before anything gets scoped, so this doesn't look like the same task with a different price on it.
What's illustrative: the two sample accounts below aren't real clients. They show what typing a client name into a working version of this page would return, using your three real branches and a plausible paid/outstanding pattern. A real build would read from wherever your invoices actually live today, not replace how they're created.