diff --git a/lib/spec/openapi/utils.js b/lib/spec/openapi/utils.js
index a448138f..01b0e8a7 100644
--- a/lib/spec/openapi/utils.js
+++ b/lib/spec/openapi/utils.js
@@ -391,41 +391,48 @@ function resolveResponse (fastifyResponseJson, produces, ref) {
 function resolveCallbacks (schema, ref) {
   const callbacksContainer = {}
 
+  // Iterate over each callback event
   for (const eventName in schema) {
     if (!schema[eventName]) {
       continue
     }
 
+    // Create an empty object to house the future iterations
+    callbacksContainer[eventName] = {}
     const eventSchema = schema[eventName]
-    const [callbackUrl] = Object.keys(eventSchema)
 
-    if (!callbackUrl || !eventSchema[callbackUrl]) {
-      continue
-    }
+    // Iterate over each callbackUrl for the event
+    for (const callbackUrl in eventSchema) {
+      if (!callbackUrl || !eventSchema[callbackUrl]) {
+        continue
+      }
 
-    const callbackSchema = schema[eventName][callbackUrl]
-    const [httpMethodName] = Object.keys(callbackSchema)
+      // Create an empty object to house the future iterations
+      callbacksContainer[eventName][callbackUrl] = {}
+      const callbackSchema = eventSchema[callbackUrl]
 
-    if (!httpMethodName || !callbackSchema[httpMethodName]) {
-      continue
-    }
+      // Iterate over each httpMethod for the callbackUrl
+      for (const httpMethodName in callbackSchema) {
+        if (!httpMethodName || !callbackSchema[httpMethodName]) {
+          continue
+        }
 
-    const httpMethodSchema = callbackSchema[httpMethodName]
-    const httpMethodContainer = {}
+        const httpMethodSchema = callbackSchema[httpMethodName]
+        const httpMethodContainer = {}
 
-    if (httpMethodSchema.requestBody) {
-      httpMethodContainer.requestBody = convertJsonSchemaToOpenapi3(
-        ref.resolve(httpMethodSchema.requestBody)
-      )
-    }
+        if (httpMethodSchema.requestBody) {
+          httpMethodContainer.requestBody = convertJsonSchemaToOpenapi3(
+            ref.resolve(httpMethodSchema.requestBody)
+          )
+        }
 
-    httpMethodContainer.responses = httpMethodSchema.responses
-      ? convertJsonSchemaToOpenapi3(ref.resolve(httpMethodSchema.responses))
-      : { '2XX': { description: 'Default Response' } }
+        // If a response is not provided, set a 2XX default response
+        httpMethodContainer.responses = httpMethodSchema.responses
+          ? convertJsonSchemaToOpenapi3(ref.resolve(httpMethodSchema.responses))
+          : { '2XX': { description: 'Default Response' } }
 
-    callbacksContainer[eventName] = {
-      [callbackUrl]: {
-        [httpMethodName]: httpMethodContainer
+        // Set the schema at the appropriate location in the response object
+        callbacksContainer[eventName][callbackUrl][httpMethodName] = httpMethodContainer
       }
     }
   }
diff --git a/test/spec/openapi/schema.js b/test/spec/openapi/schema.js
index 53c463b9..03431f1c 100644
--- a/test/spec/openapi/schema.js
+++ b/test/spec/openapi/schema.js
@@ -1382,7 +1382,7 @@ test('support callbacks', async () => {
     await Swagger.validate(openapiObject)
   })
 
-  test('skips callbacks if badly formatted', async t => {
+  test('skips callbacks if event is badly formatted', async t => {
     const fastify = Fastify()
 
     await fastify.register(fastifySwagger, openapiOption)
@@ -1432,7 +1432,7 @@ test('support callbacks', async () => {
     await Swagger.validate(openapiObject)
   })
 
-  test('skips callback if event is badly formatted', async t => {
+  test('skips callback if callbackUrl is badly formatted', async t => {
     const fastify = Fastify()
 
     await fastify.register(fastifySwagger, openapiOption)
@@ -1492,7 +1492,7 @@ test('support callbacks', async () => {
                 }
               },
               myOtherEvent: {
-                '{$request.body#/callbackUrl}': {}
+                '{$request.body#/callbackUrl}': null
               }
             }
           }
@@ -1586,7 +1586,11 @@ test('support callbacks', async () => {
                   }
                 }
               },
-              myOtherEvent: {}
+              myOtherEvent: {
+                '{$request.body#/callbackUrl}': {
+                  post: null
+                }
+              }
             }
           }
         },
@@ -1619,4 +1623,186 @@ test('support callbacks', async () => {
 
     await Swagger.validate(openapiObject)
   })
+
+  test('supports multiple callbackUrls and httpMethods in openapiObject', async t => {
+    const fastify = Fastify()
+
+    await fastify.register(fastifySwagger, openapiOption)
+    fastify.register(async (instance) => {
+      instance.post(
+        '/subscribe',
+        {
+          schema: {
+            body: {
+              $id: 'Subscription',
+              type: 'object',
+              properties: {
+                callbackUrl: {
+                  type: 'string',
+                  examples: ['https://example.com']
+                }
+              }
+            },
+            response: {
+              200: {
+                $id: 'Subscription',
+                type: 'object',
+                properties: {
+                  callbackUrl: {
+                    type: 'string',
+                    examples: ['https://example.com']
+                  }
+                }
+              }
+            },
+            callbacks: {
+              myEvent: {
+                '{$request.body#/callbackUrl}': {
+                  post: {
+                    requestBody: {
+                      content: {
+                        'application/json': {
+                          schema: {
+                            type: 'object',
+                            properties: {
+                              message: {
+                                type: 'string',
+                                example: 'Some event happened'
+                              }
+                            },
+                            required: ['message']
+                          }
+                        }
+                      }
+                    },
+                    responses: {
+                      200: {
+                        description: 'Success'
+                      }
+                    }
+                  }
+                },
+                '{$request.body#/anotherUrl}': {
+                  post: {
+                    requestBody: {
+                      content: {
+                        'application/json': {
+                          schema: {
+                            type: 'object',
+                            properties: {
+                              message: {
+                                type: 'string',
+                                example: 'Another event happened'
+                              }
+                            },
+                            required: ['message']
+                          }
+                        }
+                      }
+                    },
+                    responses: {
+                      200: {
+                        description: 'Success'
+                      }
+                    }
+                  },
+                  put: {
+                    requestBody: {
+                      content: {
+                        'application/json': {
+                          schema: {
+                            type: 'object',
+                            properties: {
+                              message: {
+                                type: 'string',
+                                example: 'PUT event happened'
+                              }
+                            },
+                            required: ['message']
+                          }
+                        }
+                      }
+                    },
+                    responses: {
+                      200: {
+                        description: 'Success'
+                      }
+                    }
+                  }
+                }
+              },
+              myOtherEvent: {
+                '{$request.body#/callbackUrl}': {
+                  post: {
+                    responses: {
+                      200: {
+                        description: 'Success'
+                      },
+                      500: {
+                        description: 'Error'
+                      }
+                    }
+                  }
+                }
+              }
+            }
+          }
+        },
+        () => {}
+      )
+    })
+
+    await fastify.ready()
+
+    const openapiObject = fastify.swagger()
+
+    t.equal(typeof openapiObject, 'object')
+    t.equal(typeof openapiObject.paths['/subscribe'].post.callbacks, 'object')
+
+    const definedPath = openapiObject.paths['/subscribe'].post.callbacks
+
+    // First Event->First URL->First Method
+    t.strictSame(
+      definedPath.myEvent['{$request.body#/callbackUrl}'].post.requestBody
+        .content['application/json'].schema.properties,
+      {
+        message: {
+          type: 'string',
+          example: 'Some event happened'
+        }
+      }
+    )
+
+    // First Event->Second URL->First Method
+    t.strictSame(
+      definedPath.myEvent['{$request.body#/anotherUrl}'].post.requestBody
+        .content['application/json'].schema.properties,
+      {
+        message: {
+          type: 'string',
+          example: 'Another event happened'
+        }
+      }
+    )
+
+    // First Event->Second URL->Second Method
+    t.strictSame(
+      definedPath.myEvent['{$request.body#/anotherUrl}'].put.requestBody
+        .content['application/json'].schema.properties,
+      {
+        message: {
+          type: 'string',
+          example: 'PUT event happened'
+        }
+      }
+    )
+
+    // Second Event
+    t.same(
+      definedPath.myOtherEvent['{$request.body#/callbackUrl}'].post.requestBody,
+      null
+    )
+
+    await Swagger.validate(openapiObject)
+  })
 })