Integration case study
How a Dublin MNC Plugged IMPT Into Its Existing TMC Programme
Published 2026-05-07 by the ESG IMPT editors
A Dublin-based multinational added IMPT to its travel management company (TMC) programme by treating the platform as a preferred supplier for ESG-compliant accommodation. The integration required no IT rebuild: the TMC added IMPT's booking link to its portal, policy was updated to prioritise IMPT hotels, and the finance team mapped carbon retirements (1 tonne UN-verified CO₂ per booking) directly into SCOPE 3 reports. Travel arrangers book through IMPT, guests pay standard nightly rates, and the company captures verifiable emissions reductions without disrupting existing workflows.
The Brief: Deliver ESG Wins Without Ripping Up the Booking Stack
In early 2025, a Dublin-headquartered enterprise software firm employing 4,200 people across EMEA faced a familiar squeeze. Its annual sustainability report flagged business travel as the second-largest contributor to SCOPE 3 emissions—accounting for 22 per cent of the company's total footprint—and the board wanted a plan that combined speed, auditability, and zero new capex.
The firm already contracted a Tier‑1 travel management company (TMC) for flights, rail, and hotel inventory. Executives were clear: they would not fund a parallel booking system, re-train 400 monthly travellers, or ask the procurement team to renegotiate supplier terms mid-cycle. The ESG officer needed a solution that layered onto existing workflows and produced verifiable carbon retirements, not vague offsets or future promises.
After evaluating three platforms, the company chose IMPT. The deciding factor was mechanical simplicity: every hotel booking through IMPT retires 1 tonne of UN-verified CO₂ on-chain—28 times the average per-night hotel footprint—and IMPT funds the retirement from its commission, so the guest pays the standard nightly rate. No surcharge, no manual offset purchase, no reconciliation headaches.
Integration Architecture: Preferred Supplier, Not Parallel System
The TMC treated IMPT as a new preferred accommodation supplier and embedded its booking link into the company's online booking tool (OBT). The technical lift was minimal:
- Portal update: The TMC added a branded tile labelled "ESG-Compliant Hotels (IMPT)" to the accommodation menu, linking directly to IMPT's search interface.
- Policy amendment: The travel policy was updated to state that all bookings in Dublin, Cork, and Galway must default to IMPT inventory unless the traveller receives written approval from their line manager and the ESG officer.
- Invoice reconciliation: IMPT invoices the TMC monthly; the TMC consolidates IMPT charges into the company's existing travel invoice, preserving cost-centre allocation and GL codes.
- Carbon reporting API: IMPT provides a monthly JSON feed listing booking references, retirement certificate hashes, and tonnage. The finance team imports this into the company's SCOPE 3 tracker without manual data entry.
From scoping call to live deployment, the process took six weeks. The longest delay was internal: aligning legal, procurement, and IT sign-offs. IMPT itself required only a master service agreement and a single webhook endpoint for the carbon API.
Traveller Experience: Zero Friction, Maximum Compliance
The company's travel arrangers—typically executive assistants and team leads—report that the IMPT flow feels identical to booking through the TMC's legacy hotel suppliers. The arranger searches by city and dates, reviews availability and nightly rates, and confirms the booking. Payment is handled via the TMC's corporate card on file, so there is no split settlement or out-of-pocket reimbursement.
Guests check in and out exactly as they would at any other property. The only visible difference is a one-line confirmation email sent by IMPT 48 hours post-checkout, linking to the on-chain retirement certificate for that specific booking. The certificate displays the booking reference, hotel name, tonnage retired, and the Verra or Gold Standard registry ID. Guests can share the certificate URL in their trip reports or ESG dashboards if required by internal audit.
During the first 90 days, traveller adoption in Dublin and Cork ran at 87 per cent—materially higher than the company's previous voluntary carbon-offset programme, which peaked at 19 per cent participation. The ESG officer attributes the jump to two factors: default policy (opt-out rather than opt-in) and zero price premium. When the sustainable choice costs the same and requires no extra clicks, compliance becomes automatic.
Search ESG-compliant hotels for your next corporate trip →Finance and Reporting: One Line Item, Full Auditability
The finance team values the cleanness of the model. IMPT bookings appear on the TMC invoice as a single aggregated line each month: "IMPT Accommodation – [number] nights @ [blended average rate]." Cost-centre attribution flows through booking metadata, so department budgets remain intact. There is no separate carbon-offset invoice to reconcile, no manual journal entries, and no FX risk—all pricing is in euro.
For SCOPE 3 disclosure, the monthly carbon API delivers a CSV and JSON file containing:
- Booking reference
- Check-in and check-out dates
- Hotel name and city
- Tonnes CO₂ retired
- Registry certificate URL
- Retirement transaction hash (blockchain record)
The sustainability team imports this file into the company's carbon accounting platform (in this case, Watershed) using a pre-built connector. The result: real-time visibility into avoided emissions, with full traceability back to individual bookings. During the company's mid-year ESG audit, external verifiers praised the granularity and immutability of the on-chain records—a marked improvement over previous years' aggregated offset statements.
Commercial and Procurement Considerations
IMPT operates on a commission model typical of online travel agencies: the platform earns a percentage of each booking and uses that margin to fund the 1‑tonne carbon retirement. The guest pays the published nightly rate; the hotel remits the commission to IMPT; IMPT purchases and retires the carbon credit. The cycle is self-funding and requires no incremental budget from the corporate client.
The Dublin firm's procurement team conducted a rate-parity audit three months into the pilot. They compared 120 IMPT bookings against equivalent properties on the TMC's legacy suppliers and found average rate deviation of +1.8 per cent—well within the company's acceptable corridor and offset by the elimination of separate carbon-offset fees, which previously ran at €15–25 per night when travellers opted in.
The contract structure is straightforward: a one-year master service agreement with quarterly reviews, no minimum room-night commitment, and 30-day termination for convenience. IMPT does not charge setup fees, API access fees, or reporting fees. The commercial risk is minimal, and scalability is immediate—when the company opened a new office in Galway, travel policy updates and IMPT availability in that city were live within 48 hours.
Lessons and Expansion Plans
Six months into deployment, the company has logged 1,340 IMPT bookings and retired 1,340 tonnes of CO₂—equivalent to removing 291 petrol cars from the road for a year. The ESG officer credits three factors for smooth adoption:
- Policy primacy: Making IMPT the default, not an option, eliminated decision fatigue.
- Economic neutrality: Travellers and budget holders faced no cost penalty.
- Data integration: Automated carbon reporting reduced manual workload for the sustainability team by an estimated 12 hours per month.
The firm is now extending the programme to its UK offices (London, Manchester, Edinburgh) and evaluating IMPT coverage in Amsterdam and Berlin for Q4 2025 EMEA leadership summits. The TMC has proposed adding IMPT as a preferred supplier across its entire client book, citing the Dublin case study as proof that ESG compliance and operational simplicity are not mutually exclusive.
Frequently Asked Questions
Do we need to replace our existing TMC to use IMPT?
No. IMPT functions as a preferred supplier within your current TMC arrangement. Your TMC adds IMPT's booking link to your online tool, and invoices consolidate into your existing travel billing. No parallel systems or dual logins are required.
How does the 1‑tonne carbon retirement per booking get funded?
IMPT funds the retirement from its commission on each booking. The mechanic is exact: 1 tonne of UN-verified CO₂ is retired on-chain per booking—28 times the average per-night hotel footprint. The guest pays the standard nightly rate, with no surcharge.
Can our auditors verify the carbon retirements?
Yes. Each booking generates an on-chain retirement certificate with a unique transaction hash, registry ID (Verra or Gold Standard), and immutable timestamp. IMPT provides monthly reporting files that link booking references to certificate URLs, meeting the evidentiary standards for SCOPE 3 assurance engagements.
What happens if an IMPT hotel is not available for a specific trip?
Your travel policy can define fallback rules—for example, allowing travellers to book through legacy suppliers if no IMPT property is available within a defined radius or rate threshold. The Dublin case study used a line-manager approval process for exceptions, which maintained high compliance while preserving flexibility for edge cases.
Find your next ESG-compliant hotel in Ireland →