Why might a payment partner require prefunding or a bank guarantee, and how does that affect my operating limit?

The underlying issue is counterparty risk. If you receive funds on a promise to complete a payment, your licensed partner needs to understand what happens if you or another party in the chain fails to deliver.

If an operator controls funds without prefunding, routing the money through the principal’s accounts, or establishing an agreed joint-custody structure, the principal may face an obligation without corresponding control over the money. A bank guarantee is one protection the principal may require to address that exposure.

Prefunding provides funds in advance under the agreed arrangement. A bank guarantee provides a different form of protection, subject to its wording, issuer, and acceptance by the partner. Whether either is required, and whether it is sufficient, depends on the actual structure and the partner’s assessment.

As a simple illustration, if a partner accepts a guarantee covering €100,000 and sets the exposure limit at that amount, you cannot have more than €100,000 outstanding and unsettled at one time. As settlement completes and exposure falls, capacity becomes available again under the agreed terms. That is an outstanding-exposure limit, rather than necessarily a monthly turnover cap.

Before proceeding, agree how exposure is measured, when a transaction counts as fully settled, and what happens when the limit is reached. The protection must match the flow of funds. A guarantee requirement from one arrangement should not be treated as a universal rule for every payment business.