generated: '2026-07-25'
method: derived
source: callbacks[] declared in the harvested OpenAPI documents
spec_type: null
asyncapi_published: false
note: The GSMA publishes no AsyncAPI document and operates no event broker — it is a specification publisher, not an
  endpoint operator. Five of the eighteen harvested specifications do declare a real, machine-readable webhook surface
  as OpenAPI callbacks[], captured below. The four Open Gateway specs deliver CloudEvents 1.0 notifications by HTTP POST
  to a consumer-supplied sink URL, authenticated with the notificationsBearerAuth scheme and a sinkCredential supplied
  on the subscribing request. The Mobile Money API delivers its asynchronous results by HTTP PUT to the URL the client
  passes in the X-Callback-URL header. Nothing here was invented; every entry maps to a callback object in a saved spec.
delivery:
- programme: GSMA Open Gateway (CAMARA)
  style: CloudEvents 1.0 over HTTP POST
  sink: '{$request.body#/sink}'
  credential: sinkCredential on the request body
  auth_scheme: notificationsBearerAuth (http bearer)
- programme: GSMA Mobile Money API
  style: HTTP PUT of the completed resource (or error object)
  sink: '{$request.header.X-Callback-URL}'
  correlation: X-CorrelationID supplied by the client on the originating request
  fallback: Asynchronous with polling — GET /requeststates/{serverCorrelationId}
surface_count: 5
surfaces:
- api: Mobile Money API
  spec: openapi/gsma-mobile-money-api-openapi.yml
  callback_count: 58
  event_types: null
  callbacks:
  - callback: transactionsSuccessEvent
    sink_expression: '{$request.header.X-Callback-URL}'
    method: PUT
    operationId: transactionsSuccessPUT
    summary: Transaction Success Callback
    triggered_by: POST /transactions
  - callback: transactionsFailureEvent
    sink_expression: '{$request.header.X-Callback-URL}'
    method: PUT
    operationId: transactionsFailurePUT
    summary: Transaction Failure Callback
    triggered_by: POST /transactions
  - callback: transactionsSuccessEvent
    sink_expression: '{$request.header.X-Callback-URL}'
    method: PUT
    operationId: transactionsTransactionTypeSuccessPUT
    summary: Transaction Success Callback
    triggered_by: POST /transactions/type/{transactionType}
  - callback: transactionsFailureEvent
    sink_expression: '{$request.header.X-Callback-URL}'
    method: PUT
    operationId: transactionsTransactionTypeFailurePUT
    summary: Transaction Failure Callback
    triggered_by: POST /transactions/type/{transactionType}
  - callback: transactionsUpdateSuccessEvent
    sink_expression: '{$request.header.X-Callback-URL}'
    method: PUT
    operationId: transactionsTransactionsUpdatePUT
    summary: Transactions Update Success Callback
    triggered_by: PATCH /transactions/{transactionReference}
  - callback: transactionsUpdateFailureEvent
    sink_expression: '{$request.header.X-Callback-URL}'
    method: PUT
    operationId: transactionsTransactionsUpdateFailurePUT
    summary: Transaction Update Failure Callback
    triggered_by: PATCH /transactions/{transactionReference}
  - callback: reversalsSuccessEvent
    sink_expression: '{$request.header.X-Callback-URL}'
    method: PUT
    operationId: transactionsTransactionReferenceReversalsSuccessPUT
    summary: Reversal Callback
    triggered_by: POST /transactions/{transactionReference}/reversals
  - callback: reversalsFailureEvent
    sink_expression: '{$request.header.X-Callback-URL}'
    method: PUT
    operationId: transactionsTransactionReferenceReversalfailurePUT
    summary: Reversal Failure Callback
    triggered_by: POST /transactions/{transactionReference}/reversals
  - callback: batchTransactionsSuccessEvent
    sink_expression: '{$request.header.X-Callback-URL}'
    method: PUT
    operationId: transactionsBatchTransactionsSuccessPUT
    summary: Batch Transactions Callback
    triggered_by: POST /batchtransactions
  - callback: batchTransactionsFailureEvent
    sink_expression: '{$request.header.X-Callback-URL}'
    method: PUT
    operationId: transactionsBatchTransactionsFailurePUT
    summary: Batch Transaction Failure Callback
    triggered_by: POST /batchtransactions
  - callback: batchTransactionsUpdateSuccessEvent
    sink_expression: '{$request.header.X-Callback-URL}'
    method: PUT
    operationId: transactionsBatchTransactionsUpdatePUT
    summary: Batch Transactions Update Success Callback
    triggered_by: PATCH /batchtransactions/{batchId}
  - callback: batchTransactionsUpdateFailureEvent
    sink_expression: '{$request.header.X-Callback-URL}'
    method: PUT
    operationId: transactionsBatchTransactionsUpdateFailurePUT
    summary: Batch Transaction Update Failure Callback
    triggered_by: PATCH /batchtransactions/{batchId}
  - callback: accountsSuccessEvent
    sink_expression: '{$request.header.X-Callback-URL}'
    method: PUT
    operationId: accountsSuccessPUT
    summary: Account Success Callback
    triggered_by: POST /accounts/{identityType}
  - callback: accountsFailureEvent
    sink_expression: '{$request.header.X-Callback-URL}'
    method: PUT
    operationId: accountsFailurePUT
    summary: Account Failure Callback
    triggered_by: POST /accounts/{identityType}
  - callback: accountsUpdateSuccessEvent
    sink_expression: '{$request.header.X-Callback-URL}'
    method: PUT
    operationId: accountsUpdateAccountIdSuccessPUT
    summary: Account Update Success Callback
    triggered_by: PATCH /accounts/{accountId}
  - callback: accountsUpdateFailureEvent
    sink_expression: '{$request.header.X-Callback-URL}'
    method: PUT
    operationId: accountsUpdateAccountIdFailurePUT
    summary: Account Update Failure Callback
    triggered_by: PATCH /accounts/{accountId}
  - callback: accountsUpdateSuccessEvent
    sink_expression: '{$request.header.X-Callback-URL}'
    method: PUT
    operationId: accountsUpdateIdentifierTypeIdentifierSuccessPUT
    summary: Account Update Success Callback
    triggered_by: PATCH /accounts/{identifierType}/{identifier}
  - callback: accountsUpdateFailureEvent
    sink_expression: '{$request.header.X-Callback-URL}'
    method: PUT
    operationId: accountsUpdateIdentifierTypeIdentifierFailurePUT
    summary: Account Update Failure Callback
    triggered_by: PATCH /accounts/{identifierType}/{identifier}
  - callback: accountIdentitiesUpdateSuccessEvent
    sink_expression: '{$request.header.X-Callback-URL}'
    method: PUT
    operationId: accountIdentitiesUpdateAccountIdSuccessPUT
    summary: Account Identity Update Success Callback
    triggered_by: PATCH /accounts/{accountId}/identities/{identityId}
  - callback: accountIdentitiesUpdateFailureEvent
    sink_expression: '{$request.header.X-Callback-URL}'
    method: PUT
    operationId: accountIdentitiesUpdateAccountIdFailurePUT
    summary: Account Identities Update Failure Callback
    triggered_by: PATCH /accounts/{accountId}/identities/{identityId}
  - callback: accountsUpdateSuccessEvent
    sink_expression: '{$request.header.X-Callback-URL}'
    method: PUT
    operationId: accountIdentitiesUpdateIdentifierTypeIdentifierSuccessPUT
    summary: Account Identity Update Success Callback
    triggered_by: PATCH /accounts/{identifierType}/{identifier}/identities/{identityId}
  - callback: accountIdentitiesUpdateFailureEvent
    sink_expression: '{$request.header.X-Callback-URL}'
    method: PUT
    operationId: accountIdentitiesUpdateIdentifierTypeIdentifierFailurePUT
    summary: Account Identity Update Failure Callback
    triggered_by: PATCH /accounts/{identifierType}/{identifier}/identities/{identityId}
  - callback: billsPaymentsSuccessEvent
    sink_expression: '{$request.header.X-Callback-URL}'
    method: PUT
    operationId: billsPaymentsSuccessPUT
    summary: Bill Payments Success Callback
    triggered_by: POST /accounts/{accountId}/bills/{billReference}/payments
  - callback: billsPaymentsFailureEvent
    sink_expression: '{$request.header.X-Callback-URL}'
    method: PUT
    operationId: billsPaymentsFailurePUT
    summary: Bill Payments Failure Callback
    triggered_by: POST /accounts/{accountId}/bills/{billReference}/payments
  - callback: billsPaymentsSuccessEvent
    sink_expression: '{$request.header.X-Callback-URL}'
    method: PUT
    operationId: billsPaymentsIdentifierTypeIdentifierSuccessPUT
    summary: Bill Payments Success Callback
    triggered_by: POST /accounts/{identifierType}/{identifier}/bills/{billReference}/payments
  - callback: billsPaymentsFailureEvent
    sink_expression: '{$request.header.X-Callback-URL}'
    method: PUT
    operationId: billsPaymentsIdentifierTypeIdentifierFailurePUT
    summary: Bill Payments Failure Callback
    triggered_by: POST /accounts/{identifierType}/{identifier}/bills/{billReference}/payments
  - callback: billsPaymentsSuccessEvent
    sink_expression: '{$request.header.X-Callback-URL}'
    method: PUT
    operationId: billsPaymentsReferenceSuccessPUT
    summary: Bill Payments Success Callback
    triggered_by: POST /bills/{billReference}/payments
  - callback: billsPaymentsFailureEvent
    sink_expression: '{$request.header.X-Callback-URL}'
    method: PUT
    operationId: billsPaymentsReferenceFailurePUT
    summary: Bill Payments Failure Callback
    triggered_by: POST /bills/{billReference}/payments
  - callback: billsPaymentsSuccessEvent
    sink_expression: '{$request.header.X-Callback-URL}'
    method: PUT
    operationId: billsPaymentsSuccessPUT
    summary: Bill Payments Success Callback
    triggered_by: POST /accounts/{accountId}/bills/payments
  - callback: billsPaymentsFailureEvent
    sink_expression: '{$request.header.X-Callback-URL}'
    method: PUT
    operationId: billsPaymentsFailurePUT
    summary: Bill Payments Failure Callback
    triggered_by: POST /accounts/{accountId}/bills/payments
  - callback: billsPaymentsSuccessEvent
    sink_expression: '{$request.header.X-Callback-URL}'
    method: PUT
    operationId: billsPaymentsIdentifierTypeIdentifierSuccessPUT
    summary: Bill Payments Success Callback
    triggered_by: POST /accounts/{identifierType}/{identifier}/bills/payments
  - callback: billsPaymentsFailureEvent
    sink_expression: '{$request.header.X-Callback-URL}'
    method: PUT
    operationId: billsPaymentsIdentifierTypeIdentifierFailurePUT
    summary: Bill Payments Failure Callback
    triggered_by: POST /accounts/{identifierType}/{identifier}/bills/payments
  - callback: debitMandatesSuccessEvent
    sink_expression: '{$request.header.X-Callback-URL}'
    method: PUT
    operationId: debitMandatesAccountIdSuccessPUT
    summary: Debit Mandates Success Callback
    triggered_by: POST /accounts/{accountId}/debitmandates
  - callback: debitMandatesFailureEvent
    sink_expression: '{$request.header.X-Callback-URL}'
    method: PUT
    operationId: debitMandatesAccountIdFailurePUT
    summary: Debit Mandates Failure Callback
    triggered_by: POST /accounts/{accountId}/debitmandates
  - callback: debitMandatesSuccessEvent
    sink_expression: '{$request.header.X-Callback-URL}'
    method: PUT
    operationId: debitMandatesIdentifierTypeIdentifierSuccessPUT
    summary: Debit Mandates Success Callback
    triggered_by: POST /accounts/{identifierType}/{identifier}/debitmandates
  - callback: debitMandatesFailureEvent
    sink_expression: '{$request.header.X-Callback-URL}'
    method: PUT
    operationId: debitMandatesIdentifierTypeIdentifierFailurePUT
    summary: Debit Mandates Failure Callback
    triggered_by: POST /accounts/{identifierType}/{identifier}/debitmandates
  - callback: debitMandatesUpdateSuccessEvent
    sink_expression: '{$request.header.X-Callback-URL}'
    method: PUT
    operationId: debitMandateUpdateAccountIdSuccessPUT
    summary: Debit Mandate Update Success Callback
    triggered_by: PATCH /accounts/{accountId}/debitmandates/{debitMandateReference}
  - callback: debitMandateUpdateFailureEvent
    sink_expression: '{$request.header.X-Callback-URL}'
    method: PUT
    operationId: debitMandateUpdateAccountIdFailurePUT
    summary: Debit Mandate Update Failure Callback
    triggered_by: PATCH /accounts/{accountId}/debitmandates/{debitMandateReference}
  - callback: debitMandatesUpdateSuccessEvent
    sink_expression: '{$request.header.X-Callback-URL}'
    method: PUT
    operationId: debitMandateUpdateIdentifierTypeIdentifierSuccessPUT
    summary: Debit Mandate Update Success Callback
    triggered_by: PATCH /accounts/{identifierType}/{identifier}/debitmandates/{debitMandateReference}
  - callback: debitMandateUpdateFailureEvent
    sink_expression: '{$request.header.X-Callback-URL}'
    method: PUT
    operationId: debitMandateUpdateIdentifierTypeIdentifierFailurePUT
    summary: Debit Mandate Update Failure Callback
    triggered_by: PATCH /accounts/{identifierType}/{identifier}/debitmandates/{debitMandateReference}
  - callback: linksSuccessEvent
    sink_expression: '{$request.header.X-Callback-URL}'
    method: PUT
    operationId: linksAccountIdSuccessPUT
    summary: Links Success Callback
    triggered_by: POST /accounts/{accountId}/links
  - callback: linksFailureEvent
    sink_expression: '{$request.header.X-Callback-URL}'
    method: PUT
    operationId: linksAccountIdFailurePUT
    summary: Links Failure Callback
    triggered_by: POST /accounts/{accountId}/links
  - callback: linksSuccessEvent
    sink_expression: '{$request.header.X-Callback-URL}'
    method: PUT
    operationId: linksIdentifierTypeIdentifierSuccessPUT
    summary: Links Success Callback
    triggered_by: POST /accounts/{identifierType}/{identifier}/links
  - callback: linksFailureEvent
    sink_expression: '{$request.header.X-Callback-URL}'
    method: PUT
    operationId: linksIdentifierTypeIdentifierFailurePUT
    summary: Links Failure Callback
    triggered_by: POST /accounts/{identifierType}/{identifier}/links
  - callback: linksUpdateSuccessEvent
    sink_expression: '{$request.header.X-Callback-URL}'
    method: PUT
    operationId: linkUpdateAccountIdSuccessPUT
    summary: Account Link Update Success Callback
    triggered_by: PATCH /accounts/{accountId}/links/{linkReference}
  - callback: linkUpdateFailureEvent
    sink_expression: '{$request.header.X-Callback-URL}'
    method: PUT
    operationId: linkUpdateAccountIdFailurePUT
    summary: Account Link Update Failure Callback
    triggered_by: PATCH /accounts/{accountId}/links/{linkReference}
  - callback: linksUpdateSuccessEvent
    sink_expression: '{$request.header.X-Callback-URL}'
    method: PUT
    operationId: linkUpdateIdentifierTypeIdentifierSuccessPUT
    summary: Account Link Update Success Callback
    triggered_by: PATCH /accounts/{identifierType}/{identifier}/links/{linkReference}
  - callback: linkUpdateFailureEvent
    sink_expression: '{$request.header.X-Callback-URL}'
    method: PUT
    operationId: linkUpdateIdentifierTypeIdentifierFailurePUT
    summary: Account Link Update Failure Callback
    triggered_by: PATCH /accounts/{identifierType}/{identifier}/links/{linkReference}
  - callback: quotationsSuccessEvent
    sink_expression: '{$request.header.X-Callback-URL}'
    method: PUT
    operationId: quotationsSuccessPUT
    summary: Quotations Success Callback
    triggered_by: POST /quotations
  - callback: quotationsFailureEvent
    sink_expression: '{$request.header.X-Callback-URL}'
    method: PUT
    operationId: quotationsFailurePUT
    summary: Quotations Failure Callback
    triggered_by: POST /quotations
  - callback: authorisationCodesSuccessEvent
    sink_expression: '{$request.header.X-Callback-URL}'
    method: PUT
    operationId: authorisationCodesAccountIdSuccessPUT
    summary: Authorisation Codes Success Callback
    triggered_by: POST /accounts/{accountId}/authorisationcodes
  - callback: authorisationCodesFailureEvent
    sink_expression: '{$request.header.X-Callback-URL}'
    method: PUT
    operationId: authorisationCodesAccountIdFailurePUT
    summary: Authorisation Codes Failure Callback
    triggered_by: POST /accounts/{accountId}/authorisationcodes
  - callback: authorisationCodesSuccessEvent
    sink_expression: '{$request.header.X-Callback-URL}'
    method: PUT
    operationId: authorisationCodesIdentifierTypeIdentifierSuccessPUT
    summary: Authorisation Codes Success Callback
    triggered_by: POST /accounts/{identifierType}/{identifier}/authorisationcodes
  - callback: authorisationCodesFailureEvent
    sink_expression: '{$request.header.X-Callback-URL}'
    method: PUT
    operationId: authorisationCodesIdentifierTypeIdentifierFailurePUT
    summary: Authorisation Codes Failure Callback
    triggered_by: POST /accounts/{identifierType}/{identifier}/authorisationcodes
  - callback: authorisationCodesSuccessEvent
    sink_expression: '{$request.header.X-Callback-URL}'
    method: PUT
    operationId: authorisationCodeUpdateAccountIdSuccessPUT
    summary: Authorisation Code Update Success Callback
    triggered_by: PATCH /accounts/{accountId}/authorisationcodes/{authorisationCode}
  - callback: authorisationCodesFailureEvent
    sink_expression: '{$request.header.X-Callback-URL}'
    method: PUT
    operationId: authorisationCodeAccountIdFailurePUT
    summary: Authorisation Code Update Failure Callback
    triggered_by: PATCH /accounts/{accountId}/authorisationcodes/{authorisationCode}
  - callback: authorisationCodesSuccessEvent
    sink_expression: '{$request.header.X-Callback-URL}'
    method: PUT
    operationId: authorisationCodeUpdateIdentifierTypeIdentifierSuccessPUT
    summary: Authorisation Code Update Success Callback
    triggered_by: PATCH /accounts/{identifierType}/{identifier}/authorisationcodes/{authorisationCode}
  - callback: authorisationCodesFailureEvent
    sink_expression: '{$request.header.X-Callback-URL}'
    method: PUT
    operationId: authorisationCodeIdentifierTypeIdentifierFailurePUT
    summary: Authorisation Code Update Failure Callback
    triggered_by: PATCH /accounts/{identifierType}/{identifier}/authorisationcodes/{authorisationCode}
- api: Carrier Billing
  spec: openapi/gsma-open-gateway-carrier-billing-openapi.yml
  callback_count: 2
  event_types:
  - org.camaraproject.carrier-billing.v0.payment-cancelled
  - org.camaraproject.carrier-billing.v0.payment-completed
  - org.camaraproject.carrier-billing.v0.payment-denied
  - org.camaraproject.carrier-billing.v0.payment-pending-validation
  - org.camaraproject.carrier-billing.v0.payment-reserved
  callbacks:
  - callback: notifications
    sink_expression: '{$request.body#/sink}'
    method: POST
    operationId: createPaymentNotification
    summary: Carrier Billing payment notifications
    triggered_by: POST /payments
  - callback: notifications
    sink_expression: '{$request.body#/sink}'
    method: POST
    operationId: preparePaymentNotification
    summary: Carrier Billing payment notifications
    triggered_by: POST /payments/prepare
- api: Carrier Billing Refund
  spec: openapi/gsma-open-gateway-carrier-billing-refund-openapi.yml
  callback_count: 1
  event_types:
  - org.camaraproject.carrier-billing-refund.v0.refund-completed
  - org.camaraproject.carrier-billing-refund.v0.refund-denied
  - org.camaraproject.carrier-billing-refund.v0.refund-in-bill
  - org.camaraproject.carrier-billing.v0.payment-reserved
  callbacks:
  - callback: notifications
    sink_expression: '{$request.body#/sink}'
    method: POST
    operationId: createRefundNotification
    summary: Carrier Billing refund notifications
    triggered_by: POST /payments/{paymentId}/refunds
- api: Population Density Data
  spec: openapi/gsma-open-gateway-population-density-data-openapi.yml
  callback_count: 1
  event_types: null
  callbacks:
  - callback: populationDensityDataCallback
    sink_expression: '{$request.body#/sink}'
    method: POST
    operationId: postNotification
    summary: Population Density Data callback
    triggered_by: POST /retrieve
- api: Quality-On-Demand
  spec: openapi/gsma-open-gateway-quality-on-demand-openapi.yml
  callback_count: 1
  event_types:
  - org.camaraproject.quality-on-demand.v0.qos-status-changed
  callbacks:
  - callback: notifications
    sink_expression: '{$request.body#/sink}'
    method: POST
    operationId: postNotification
    summary: Session notifications callback
    triggered_by: POST /sessions