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XSIS
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Enterprise Applications & Integration

APIs and Integration Platforms

Interfaces your systems and partners can rely on.

Why It Matters

Most businesses depend on services they do not run. A CRM, carriers, tax platforms and screening tools each have their own interface and their own way of failing.

Point-to-point scripts fail in three ways. A partner changes an interface, a message is lost at night, or nobody can say which system owns a record. We put the links behind one layer, agree a contract for each one, and make every failure visible.

What We Do

  • One controlled front door for the APIs you publish, applying access rules, limits and versions.

  • Events move between systems through a broker that keeps failed events, so a slow consumer never stops the producer.

  • We build links to partners and suppliers through their published interfaces, each with a contract and a monitor.

  • You see every message, its state and the failures that need action, with alerts that name the partner and the error.

What Changes for You

  1. Systems publish and receive data through one governed layer, so adding a partner does not mean touching every system.

  2. Every write carries an identity, so a retry cannot create a second record and a failed message waits for a person.

  3. Traces, errors and delay per partner show where a flow is stuck, and an alert names the partner and the error.

Systems We Connect

We connect the systems that publish data with the systems and partners that consume it.

  • Systems That Publish

    The ERP, CRM and finance systems expose the records and events other systems need.

  • Systems That Consume

    Internal tools and partner services receive data through a contract they can test.

  • Partners

    Carriers, tax platforms and screening providers connect through their published interfaces.

  • Events

    A change in one system reaches the others without a person copying it.

How It Connects

One drawing shows the ERP behind one layer with its partners. The other shows that layer at the centre of the estate.

ERP to Third Parties: One Platform, Many PartnersBusiness events leave the ERP once and the integration platform delivers them to each partner in the format it expects. Callbacks come back the same way. A message that still fails after its retries goes to a dead-letter queue and raises an alert with the payload attached.ERPERPCustomers, orders,invoicesXSISIntegration platformiPaaS or customservices, mapping andretriesThird partyCRMAccounts, contactsand opportunitiesThird partyLogistics andcarriersShipments andtrackingThird partyE-invoicing andtax platformClearance andreportingThird partyKYC and identityproviderVerification andscreeningServiceDead-letter queueand alertsNothing is droppedPeopleSupport team1REST · OData · webhook2REST/JSON3REST/JSON4webhook5SOAP/XML · REST6REST/JSON7webhook89

ERP to Third Parties: One Platform, Many Partners

Business events leave the ERP once and the integration platform delivers them to each partner in the format it expects. Callbacks come back the same way. A message that still fails after its retries goes to a dead-letter queue and raises an alert with the payload attached.

  • Primary flow
  • Asynchronous
  • Exception path
The flow in 9 steps

The Flow, Step by Step

  1. From ERP to Integration platform: Business events, over REST · OData · webhook (primary flow).
  2. From Integration platform to CRM: Customers and orders, over REST/JSON (primary flow).
  3. From Integration platform to Logistics and carriers: Shipments booked, over REST/JSON (primary flow).
  4. From Logistics and carriers to Integration platform: Tracking events, over webhook (asynchronous).
  5. From Integration platform to E-invoicing and tax platform: Invoices for clearance, over SOAP/XML · REST (primary flow).
  6. From Integration platform to KYC and identity provider: Identity checks, over REST/JSON (primary flow).
  7. From KYC and identity provider to Integration platform: Check results, over webhook (asynchronous).
  8. From Integration platform to Dead-letter queue and alerts: Failed after retries, to a dead-letter queue (exception path).
  9. From Dead-letter queue and alerts to Support team: Alert with the payload and the error (exception path).
The ERP at the Centre, Every Connection MonitoredBanks, stores, payment networks and third parties connect to the ERP through one integration layer. Anything that fails lands in a queue with an alert, never in silence.ERPERPSAP S/4HANA, OracleNetSuite, Dynamics365, Odoo, SageXSISIntegration layerAPIs, queues,mapping andvalidationBankBanksPayments, statusreports, statementsPOSPOS and storesSales, returns, stockand pricesGatewayPayment gatewayand acquirerCard authorisation andsettlementThird partyThird partiesCRM, logistics, tax,KYC and identityServiceMonitoring andexception queueRetries, alerts andreconciliation breaksPeopleYour operationsteam1REST/JSON · ODataIDoc2ISO 20022 pain.001SFTP H2H3camt.053MT9404REST/JSON5REST/JSON6ISO 85837SFTP8REST · SOAP · webhook910

The ERP at the Centre, Every Connection Monitored

Banks, stores, payment networks and third parties connect to the ERP through one integration layer. Anything that fails lands in a queue with an alert, never in silence.

  • Primary flow
  • Asynchronous
  • Exception path
The flow in 10 steps

The Flow, Step by Step

  1. From ERP to Integration layer: Orders, invoices and payment runs, over REST/JSON · OData · IDoc (primary flow).
  2. From Integration layer to Banks: Payment files, over ISO 20022 pain.001 · SFTP H2H (primary flow).
  3. From Banks to Integration layer: Statements, over camt.053 · MT940 (asynchronous).
  4. From POS and stores to Integration layer: Sales and returns, through an event queue, over REST/JSON (asynchronous).
  5. From Integration layer to POS and stores: Prices and stock, over REST/JSON (primary flow).
  6. From POS and stores to Payment gateway and acquirer: Card authorisation, over ISO 8583 (primary flow).
  7. From Payment gateway and acquirer to Integration layer: Settlement files, over SFTP (asynchronous).
  8. From Integration layer to Third parties: Customers, shipments and tax documents, over REST · SOAP · webhook (primary flow).
  9. From Integration layer to Monitoring and exception queue: Failed messages, to a dead-letter queue (exception path).
  10. From Monitoring and exception queue to Your operations team: Alerts and breaks to resolve (exception path).

Go-Live and Switch-Over

Each stage names what your team decides and what a consumer must prove. The old route stays open until every group has moved.

  1. List the Consumers

    You name the systems and partners that call each interface and the data they need.

  2. Publish a Contract

    We publish the fields, limits and error codes. You approve them with the first consumers.

  3. Run in Shadow

    Live traffic is copied to the new route. You see the results beside the old path without changing behaviour.

  4. Move Consumers in Groups

    You choose the order. Each group moves after its contract tests pass.

  5. Keep the Old Version

    The old route stays open for an agreed period. We remove it only when you confirm every consumer has moved.

Compliance in Every Market

Partner and customer data crosses system boundaries. We keep access and evidence close to each interface.

Access is scoped to each connection, and every call that changes data is logged. An auditor can follow a record from one system to the next. Data protection rules differ by market, so the controls sit in one layer and the local details in another.

Read the Country Guides

Platforms and Technologies

REST and GraphQL are web interfaces for reading and changing data. SOAP is the older XML-based interface some partners still require. OpenAPI is a written description of an interface's fields, errors and limits. Webhooks let a partner send an event when something changes. Apache Kafka carries events between systems. OAuth 2.0 and OpenID Connect control delegated access and sign-in. SAML is the older sign-in standard, and SCIM keeps user accounts in step. HashiCorp Vault holds credentials. Apache Camel is a routing library for moving messages between systems. RabbitMQ is a message broker that queues those messages. Microsoft Entra ID and Keycloak are identity providers that issue access tokens. MuleSoft, Boomi and Azure Logic Apps are integration platforms.

Data and analytics
  • Apache Kafka
Integration
  • REST
  • GraphQL
  • SOAP
  • OpenAPI
  • Webhooks
  • MuleSoft
  • Boomi
  • Azure Logic Apps
  • Apache Camel
  • RabbitMQ
Identity and access
  • OAuth 2.0
  • OpenID Connect
  • SAML 2.0
  • SCIM
  • Microsoft Entra ID
  • Keycloak
Security and cryptography
  • HashiCorp Vault

Naming a product does not mean a partnership with its vendor.

Questions

The questions architects and operations leaders ask before they change an integration layer.

Do we need an integration platform?

Not always. A few stable links can be direct calls. A platform pays when many systems share mapping, queues, access and monitoring. If you already own one, we build on it rather than replace it.

How do we start?

We list the systems and partners that exchange data, the owner of each record and the failures you see now. You choose the first interface. We publish its contract and test it with the consumers.

Who owns the API and the code?

You do. The interface descriptions, connector code, tests and runbooks belong to you. We keep them in your repository and use your secrets store. A partner's API remains the partner's responsibility.

How long does it take?

It depends on the number of consumers, the partner test environments and the access model. We release one group of consumers at a time.

What is not included?

Vendor licences, cloud capacity and network changes are separate. We do not promise a partner's roadmap or response time. We name each dependency and its owner in the plan.

Visit the Knowledge Base

Tell Us What You Need to Run, Build or Secure.

Describe the service, the systems and the pressure you are under. The right team takes it from there.