Payment gateway migration
Changing payment gateways requires careful planning to avoid service interruptions and maintain transaction flow. Cardflo specialises in payment gateway migration, providing a structured approach that ensures data integrity, system compatibility, and continuous payment acceptance for your business.
We manage the technical and operational complexities.
- Category
- Migration
- Capabilities
- 10
- Available on
- All plans
The overview
Payment gateway migration describes the process of transitioning a merchant's transaction processing and cardholder data environment from one service provider to another.
This procedure is typically driven by a requirement for lower interchange plus costs, improved authorisation rates, or access to specific alternative payment methods not supported by the incumbent.
The migration sits between the merchant's checkout layer and the acquirer, necessitates the secure transfer of sensitive data, and requires rigorous mapping of Merchant Category Codes and terminal configurations.
Success in this area relies on maintaining PCI DSS compliance while moving vaulted credentials, ensuring that recurring billing remains uninterrupted. A technical transition must account for differing API structures, webhooks, and reporting formats to prevent reconciliation gaps during the switch.
If managed incorrectly, a migration can lead to elevated decline rates or the loss of tokenised payment methods, directly impacting customer lifetime value and operational stability.
How it works
Technical audit and documentation
The process commences with an analysis of the existing API integrations and transaction flows. Engineering teams identify all touchpoints, including checkout pages, mobile applications, and backend server-to-server calls.
This stage defines the requirements for the new gateway, ensuring that all existing functionality is mapped correctly to the new provider's technical specifications.
Token migration and vaulting
Moving stored card data is the most critical phase for subscription-based businesses. The incumbent gateway must export cardholder data in a secure, PCI-compliant format, typically via an SFTP transfer directly to the new gateway's vault.
This allows for the recreation of tokens without requiring the customer to re-enter their details.
Integration and configuration
Developers implement the new gateway's SDKs or APIs while configuring essential settings such as 3D Secure rules, fraud velocity checks, and soft descriptor formats.
This phase often involves setting up a secondary Merchant Identification Number (MID) to facilitate parallel testing before the primary traffic is rerouted to the new environment.
Shadow testing and cutover
Before the full transition, merchants often conduct shadow testing where a small percentage of traffic is sent to the new gateway. This allows for an analysis of authorisation responses and potential soft declines.
Once the new system demonstrates stability and expected success rates, the final cutover occurs and the old gateway is decommissioned.
Why it matters
Operational continuity and retention
Inadequate migration planning can lead to the loss of stored payment credentials, forcing customers to manually update their card information. Industry data suggests that requiring re-entry of data significantly increases churn for recurring revenue models.
A managed migration preserves these tokens, ensuring that automated billing cycles continue without friction, maintaining the stability of the merchant's cash flow during the transition.
Authorisation rate optimisation
Gateway migration is often a strategic move to improve the ratio of successful transactions. Different gateways have varying levels of connectivity with regional acquirers and issuers.
By moving to a provider with better direct integrations or smarter routing logic, a business can reduce the frequency of false declines and technical errors, directly increasing the total volume of processed revenue.
Use cases
International market expansion
A merchant scaling into Europe may migrate to a gateway with better support for local schemes like Cartes Bancaires or iDEAL. This ensures higher conversion by offering preferred local payment methods.
Consolidating multiple platforms
Enterprises operating several disparate brands often migrate to a single gateway to centralise reporting and unify their Merchant Category Code management. This simplifies cross-brand financial reconciliation and treasury operations.
Reducing processing overheads
Businesses facing high scheme fees or unfavourable blended pricing may migrate to a gateway that supports interchange-plus-plus models. This allows for greater transparency and cost control over every individual transaction.
By the numbers
This range reflects typical gains observed when migrating to providers with more sophisticated routing or local acquiring capabilities, depending on the merchant's specific geographic footprint.
This is a standard industry timeframe for mid-market to enterprise migrations, spanning from the initial technical discovery phase to the final decommissioning of the legacy system.
High-integrity migrations between PCI Level 1 providers generally achieve near-total data preservation, though minor discrepancies can occur due to card expiry or data format mismatches.
Related terms
Talk to our team about a live rollout on your acquiring stack.
What you get with Payment gateway migration
- Comprehensive mapping of existing API endpoints to ensure parity in the new environment.
- Secure transfer of PCI-compliant tokenised data between competitive payment service providers.
- Configuration of Merchant Identification Numbers to match specific regional processing requirements.
- Alignment of soft descriptors to maintain clarity on customer bank statements post-migration.
- Implementation of updated 3D Secure protocols to satisfy PSD2 and SCA compliance mandates.
- Validation of webhook notifications for real-time synchronisation with internal order management systems.
- Strategic testing of authorisation response codes to identify potential issuer-side refusals early.
- Verification of refund and dispute management workflows within the new gateway interface.
- Coordination with acquirers to ensure underlying MID set-ups are optimised for the new gateway.
- Establishing fallback mechanisms to revert traffic in the event of unforeseen integration failures.
A short scoping call, then a written plan for your MIDs.
Questions about Payment gateway migration
Will a gateway migration require my customers to re-enter their credit card information?
Not if a structured token migration is performed. Most PCI Level 1 gateways facilitate the transfer of cardholder data to another compliant vault via a secure exchange.
This process involves the incumbent provider exporting the data and the new provider importing it. Once the data is re-vaulted, new tokens are generated and mapped to your existing customer IDs.
This ensures that subscriptions and one-click checkouts remain functional without any action required from the end user, although it does require coordination between the two providers' security teams.
How long does a typical payment gateway migration take to complete?
The timeline varies based on the complexity of the integration and the volume of stored tokens. A basic API integration might take two to four weeks, while a full enterprise-scale migration involving legacy data transfer and complex routing logic can take several months.
Factors influencing the duration include the responsiveness of the incumbent gateway, the thoroughness of the testing phase, and the internal development resources available to map the new API functions to existing business logic.
What are the common risks associated with switching payment gateways?
The primary risks include data loss during token transfer, technical downtime during the cutover, and an increase in false declines if the new gateway's fraud settings are not properly calibrated.
There is also a risk of reconciliation errors if the reporting formats differ significantly between systems.
To mitigate these, merchants should employ a phased approach, starting with low-volume traffic and conducting rigorous end-to-end testing of the full transaction lifecycle, including refunds and chargebacks, before full decommissioning of the old service.
Can I use multiple gateways simultaneously during the migration period?
Yes, this is often recommended and is a core component of payment orchestration. By running two gateways in parallel, merchants can perform A/B testing on authorisation rates and provide a failover option if the new integration encounters issues.
This redundant setup, often managed through a smart-routing layer, ensures that there is no single point of failure and allows for a more controlled, data-driven transition rather than a high-risk 'big bang' cutover.
How do I handle recurring payments that are mid-cycle during a migration?
Managing mid-cycle subscriptions requires careful synchronisation of the dunning logic and billing engine. The common practice is to keep the old gateway active for a transition period to handle any pending settlements or disputes.
New billing cycles are then initiated through the new gateway using the migrated tokens. It is essential to ensure that the billing engine receives real-time updates from both sources during the overlap to avoid double-charging or missed payments.
Is a new Merchant Identification Number (MID) always required when changing gateways?
Not necessarily, but it depends on the relationship between the gateway and the acquirer. If you are using a gateway-agnostic acquirer, you may be able to point your existing MID to the new gateway.
However, if you are moving to a full-stack PSP where the gateway and acquirer are bundled, a new MID will be issued.
In many cases, merchants apply for a new MID to ensure a clean slate for performance tracking and to avoid any configuration conflicts with the legacy setup.
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