Marketing spend

Client-Segregated Card Programs for Agencies

Agencies spend on behalf of clients, which makes attribution a contractual obligation rather than a convenience. Mainsail Cards supports workflows that keep each client engagement on its own card and reporting line, with limits tied to the retainer or approved budget and reporting formatted for client billing and internal review.

Reporting

Per client

Closure

Contract end

authorization.approved client 08 tagged

budget.ceiling increase requested

card.closed engagement ended

Client budget position

Demo data

Client 08 · media$32,000 / $40,000

80% of approved limit

Client 14 · production$11,500 / $12,000

96% of approved limit

Client 21 · retainer$4,200 / $15,000

28% of approved limit

Interface example only. Not connected to live card, payment, KYC, or banking systems.

Target customers

Who this is for

Marketing, media, and creative agencies
Production companies managing project spend
Consultancies with pass-through client expenses
Managed service providers purchasing on behalf of clients

Why a card program

The operational problem

Client spend on a shared agency card is hard to separate at billing time.
Budget overruns are discovered after the client has been invoiced.
Pass-through cost documentation is assembled manually each month.
Ending an engagement does not automatically stop the associated spend.

Transaction flow

How the workflow operates

1
Engagement setup
2
Client card issuance
3
Spend on behalf of the client
4
Client reporting
5
Engagement close

1
Engagement setup
Each client engagement is registered with an account owner, approved budget, billing model, and end date.
2
Client card issuance
Subject to partner approval, one or more virtual cards are issued for the engagement, capped at the approved budget.
3
Spend on behalf of the client
Media buys, production costs, and vendor fees authorize against the engagement card with the client identifier attached.
4
Client reporting
Settlement data is grouped by client, engagement, and category to support invoicing and pass-through documentation.
5
Engagement close
Cards are closed when the engagement ends, and remaining budget is released and reported.

Card and transaction characteristics

Program profile

Card type: Virtual, one or more per client engagement
Spend pattern: Retainer-aligned, with campaign and production peaks
Typical merchant categories: MCC 7311 advertising, 7333 commercial photography, 4816 network services, 5817 digital goods
Limit structure: Engagement budget cap with per-campaign sub-limits
Validity: Engagement term, closed at contract end

Merchant categories and limit structures shown here describe the intended program design and are configured with applicable program partners before launch.

Card configuration

Spend controls applied

Per-engagement budget caps that decline once exhausted
Sub-cards per campaign or production within the engagement
Client identifier carried on every transaction record
Automatic closure at engagement end date
Category restrictions matched to the scope of work

Risk and compliance

Controls that keep this scenario reviewable

Client fund segregation in reporting

Each client engagement has its own cards and reporting line, so spend, refunds, and disputes never mix across clients.

Budget ceiling enforcement

The approved budget is enforced at authorization, so an overrun becomes a decline and an approval request rather than an invoice dispute.

Engagement lifecycle control

Contract end dates drive card closure, so a terminated engagement cannot continue to generate spend.

Monitoring signals

Spend against retainer or approved budget by client
Cards active beyond an engagement end date
Concentration of spend in a single client or vendor
Refund and credit activity by client engagement
Approval frequency for budget increases by account owner

Integration touchpoints

Client and engagement records mapped to card metadata
Billing and invoicing export by client and category
Webhook events for authorization, settlement, and closure
Account owner dashboards for live budget position

Partner review

Notes for program partners

Client-level segregation supports contractual reporting obligations and keeps dispute handling attributable.
Budget ceilings and engagement-end closure keep the live credential population aligned with active contracts.

Mainsail Cards is a financial technology brand operated by MAINSAIL LLC and is not a bank. Card issuance, program scope, spend limits, and merchant category configuration for this scenario are subject to approval by applicable platform partners, issuing banks, card networks, and regulatory requirements.

Explore more

Reviewing this scenario with us?

We can share the underlying program documentation, control matrix, and operating workflow detail for this use case through partner review channels.

Contact partnerships

Client-Segregated Card Programs for Agencies

Who this is for

The operational problem

How the workflow operates

Engagement setup

Client card issuance

Spend on behalf of the client

Client reporting

Engagement close