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Bijection for Procurement

Every purchase approved, and every invoice matched.

Requests, suppliers, orders and invoices in one record, with every approval on the order itself.

A purchase starts as a Slack message, becomes a request in a form, an order in the ERP and an invoice in someone’s inbox. Checking that the invoice matches what was ordered and received means opening all of them.

Bijection links requests, suppliers, contracts, orders, receipts and invoices into one record. Approvals live on the order, invoices are matched against what was ordered and received, and each step is written back to the ERP.

  • Purchase requests

    Starts: Someone asks for a purchase

    1. Check the budget and existing contracts with the supplier.
    2. Requests above the threshold wait for approval.
    3. Approved requests become purchase orders in the ERP.

  • Invoice matching

    Starts: A supplier invoice arrives

    1. Match it against the purchase order and the goods received.
    2. Mismatches are listed with both values.
    3. Matched invoices are approved for payment.

  • Supplier onboarding

    Starts: A new supplier is selected

    1. Collect tax forms, bank details and certificates.
    2. Each item waits for its owner.
    3. The supplier is created in the ERP once every item is checked.

  • Contract renewals

    Starts: 90 days before a supplier contract ends

    1. Show spend and open issues with the supplier.
    2. The owner chooses to renew, renegotiate or exit.
    3. The decision is recorded on the contract.

  • Bank detail changes

    Starts: A supplier asks to change bank details

    1. Hold payments to the supplier.
    2. Confirm the change through a known contact.
    3. A second person approves before payments resume.

  • Spend reports

    Starts: The end of each month

    1. Group spend by supplier and category.
    2. Each figure links to its invoices.
    3. Owners review spend outside their contracts.

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