Supplier bills, the approval each one carried and the payment that followed reach Odoo from BILL, so the ledger shows what has actually been paid rather than only what somebody authorised.
An approved bill is not a paid bill, and the gap between the two is where the trouble lives. BILL records the approval and releases the payment while Odoo carries the liability, so a bill can be settled without the ledger knowing, or sit as outstanding long after the money left. Somebody notices when a supplier calls about a payment that already cleared, or worse, when a second one goes out. Connecting Odoo and BILL closes the gap: the approval, the payment and the reference travel together, and the ledger reflects the money rather than the intention.

Alumio connects to BILL through its available API, as it would any reachable system, so approvals and payment records reach Odoo without anybody reconciling two lists at month end.
A bill marked paid in BILL closes the liability in Odoo with its payment reference attached, so a supplier chasing money is answered from the ledger, not from an inbox.
Because the approval state travels with the bill, the audit question of who authorised a payment is answered from one place instead of by screenshotting a second system.
Payments are recorded against the vendor account they belong to, so a duplicate release has something to collide with rather than passing as a new and unrelated bill.
When BILL records an approval, Alumio writes the bill and its state into Odoo so the liability exists in the ledger with the authorisation attached rather than appearing in the accounts only once the money has already gone.
A payment released in BILL reaches Odoo with its reference and date, closing the bill and leaving a trail, so nobody has to decide whether an outstanding entry is genuinely unpaid or has simply never been recorded.
Because Odoo already holds the bill and its payment state, a second release for the same supplier invoice can be spotted against an existing record instead of being discovered weeks later on the bank statement by somebody else.
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What the approval depends on and nobody checks is the bank detail behind the supplier, which is where the next connection goes. A supplier onboarding and verification service is the common addition, because an approval in BILL confirms that a bill is legitimate and says nothing about whether the account it pays into still belongs to that supplier. Alumio holds both connections, so the verified detail sits against the same vendor Odoo pays.
The approval state is read first, because it decides whether anything should exist in the ledger yet. Alumio reads bills and their states from BILL and creates or updates the matching Odoo entry, then writes the payment and its reference when one is released. Bills still in approval are visible without being posted, so the ledger is not filled with liabilities nobody has agreed to.
No, and the approval rule is the part nobody should be coding. Which BILL state creates an Odoo entry, which closes it, and what happens to a bill rejected after posting are settings in Alumio, maintained by whoever owns the finance process. Where a business runs an unusual second authorisation, custom logic remains available through the Code Transformer for that step alone.
The payment record, not the approval, and the two arriving separately is the point. BILL can hold a bill approved for days before releasing it, so an approval reaching Odoo creates a liability while the payment reference is what closes it. Configuring the payment event as the trigger for settlement, rather than the approval, is what keeps the Odoo ledger describing money that has actually moved.
A payment released twice is the outcome this has to prevent, and it is the one nobody catches internally. What was attempted is logged against the BILL payment, an alert fires at once naming the reason, often a closed period or a vendor that does not match, and retries run where configured. The bill stays on the unresolved list, so nothing settles quietly outside Odoo.
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