Construction projects in Mexico run on a specific rhythm of cash in and cash out. Client advances arrive at project milestones. Supplier invoices fall due on 30, 60, and occasionally 90-day terms. Labor costs hit weekly. In that environment, not all payment methods are created equal, and the wrong one at the wrong moment creates a cash gap that narrows your operating room.
Mango supports SPEI, debit and credit card, and OXXO cash reference payments. Here is when each one makes sense — and when it creates problems you do not want during an active build.
SPEI: The Default for Large Orders and Business Accounts
SPEI (Sistema de Pagos Electrónicos Interbancarios) is the backbone of B2B payments in Mexico. It settles in real time, has no transaction ceiling for business accounts, and generates a folio number that both parties can trace. For orders above MXN 15,000, SPEI is the right payment method unless you have a specific reason to use something else.
The practical advantage: SPEI creates an immediately verifiable payment record that suppliers can confirm before releasing materials to logistics. For high-volume orders where a supplier needs payment confirmation before dispatching a fleet delivery, SPEI gives both parties the fastest clearance. The confirmation folio links directly to the CFDI invoice, which simplifies your bookkeeping and tax deduction trail.
One operational note: SPEI transactions from personal accounts have a daily limit set by your bank, typically MXN 30,000 to MXN 100,000 depending on the bank and account tier. Business accounts at most major Mexican banks have limits from MXN 500,000 to unlimited for verified commercial accounts. If you are running procurement through a personal account, you will hit SPEI limits on large orders. Move procurement to a business account before the project starts — the limit problem is not something you want to discover on the morning of a concrete pour when the supplier is waiting for payment confirmation.
When SPEI Creates Friction: The Timing Problem
SPEI is real-time between 7:00 AM and 5:30 PM on business days. Outside those windows, SPEI transfers queue for the next banking window. If you submit a SPEI payment at 6:00 PM for a delivery scheduled first thing the next morning, your supplier may not see cleared funds until mid-morning — after your delivery window has passed.
This is a real operational issue on projects with early delivery windows, which is common for concrete pours that need to beat CDMX traffic. Plan SPEI payments the business day before the delivery, not the morning of. On the Mango platform, order confirmation is separate from payment — you can lock in a delivery slot with an approved credit line and pay the invoice later, which removes the timing dependency entirely for accounts using trade credit.
SPEI also requires the exact CLABE for the recipient. Double-check the 18-digit CLABE before every transfer. A wrong-digit SPEI transfer lands in the wrong account and takes 2 to 10 business days to reverse through the banking system. This is not a hypothetical — it happens, and it stalls deliveries.
Credit Cards: The Right Tool for Equipment and Small Orders
Credit cards are the right tool when the purchase does not meet the threshold for trade credit, when you need the purchase as a revolving credit buffer between milestones, or when the supplier is a specialized vendor who does not offer net terms. Equipment rentals, specialized tools, and finishing material purchases at smaller suppliers often fall into this category.
The downside is cost. Most Mexican business credit cards carry an effective annual rate between 28% and 45%. Using a card to bridge a 60-day cash gap on a MXN 200,000 materials purchase costs MXN 9,000 to MXN 15,000 in interest. Mango's trade credit typically carries a factoring fee of 2.5% to 4% for 30-day terms and 4% to 7% for 60-day terms — considerably lower than card financing for the same period.
Where credit cards add value: small purchases where your card offers a cashback or points program that offsets cost, purchases from vendors who accept cards but do not offer net terms, and purchases in USD from US-based suppliers where your card offers FX rate certainty. For core construction materials procurement in Mexico, trade credit through Mango is almost always a lower-cost option than card financing.
Debit Cards: Use Sparingly on Active Projects
Debit card payments pull directly from your operating account. On a project where cash timing is already tight, tying up liquidity in debit purchases reduces the buffer you have for unexpected costs — and unexpected costs are a near-certainty in construction. Use debit only for purchases small enough that the cash outflow does not affect your operating position at a sensitive moment.
The common scenario where debit becomes a problem: a contractor uses debit to pay for a surprise remediation cost (unexpected soil condition, a broken utility line), depleting the account shortly before payroll is due. The supplier's credit terms were available and not used. The debit purchase felt convenient at the time; the payroll gap felt catastrophic two weeks later.
Debit is fine for hardware store runs, small tool purchases, and low-value incidentals where the simplicity of pay-and-go outweighs the cost. It is not the right instrument for orders that represent a significant share of your weekly operating cash.
OXXO: When It Makes Sense and When It Does Not
OXXO cash reference payments are available at any OXXO store across Mexico — over 20,000 locations as of 2024. The payment model: Mango generates a reference number, you bring it to an OXXO, pay cash, and the payment clears to the recipient within 24 hours. This is designed for contractors or suppliers who operate primarily in cash and do not have or prefer not to use bank transfers.
OXXO payments make sense when: the person making the payment does not have reliable banking access, when the project is in a region where banking infrastructure is limited, or when a small cash purchase needs a verifiable receipt trail. The OXXO confirmation slip is a tax-recognized payment document when the reference number is linked to a CFDI invoice.
OXXO limitations for construction procurement: there is typically a per-transaction cap of MXN 10,000 (varies by OXXO terminal configuration). Payments above this require multiple OXXO transactions, which is operationally cumbersome for anything beyond petty cash. The 24-hour clearing window also means OXXO payments do not work for same-day delivery confirmation. Use OXXO for small amounts and specific cash-flow situations, not as a primary procurement payment method on projects above MXN 500,000 in total materials spend.
Mapping Payment Methods to Project Phases
The practical guide is to align payment methods to project phase cash flow patterns:
Pre-mobilization and foundation phase: Use trade credit (Mango net terms) for structural materials — concrete, rebar, formwork. These are large orders with predictable delivery windows. Trade credit preserves your cash for labor and contingency.
Structure and framing phase: Continue with SPEI and trade credit for large orders. Use credit cards for equipment rental, which is often easier to manage on a revolving credit basis for equipment that spans multiple billing cycles.
Finishes and MEP phase: Use SPEI for verified vendors with large orders. Use card or OXXO for smaller specialty vendors, fixture purchases, and items sourced outside the Mango network. This phase has higher purchase fragmentation, so flexibility in payment method matters more.
Punch list and closeout: Use debit or card for small-volume purchases where speed and convenience outweigh cost optimization. Cash flow is typically less pressured at this phase if earlier phases were managed well.
The Trade Credit Advantage: Taking Payment Method Out of the Equation
The most consistent observation from contractors who run multiple projects through Mango is that shifting large orders to trade credit removes the payment method decision entirely for the purchases that matter most. When materials are ordered on net terms, the cash flow question becomes about when you repay the credit line, not when you move funds at order time.
This frees your operating cash for the categories where cash timing is genuinely critical: labor payments, subcontractor deposits, permit fees, and equipment costs. The projects that avoid cash gaps are almost always the ones where the contractor drew a clear line between purchases that should be on trade credit and purchases that should hit the operating account directly — and held that line through the build.
The payment method question is ultimately a cash management question. The contractors who handle it well are the ones who make these decisions in the planning phase, when they can think clearly, rather than at the point of purchase, when they are responding to an immediate operational need.