diff --git a/src/examples/BuyAsset.ts b/src/examples/BuyAsset.ts
new file mode 100644
index 0000000..643985f
--- /dev/null
+++ b/src/examples/BuyAsset.ts
@@ -0,0 +1,78 @@
+import DDO from "../ddo/DDO"
+import MetaData from "../ddo/MetaData"
+import MetaDataBase from "../ddo/MetaDataBase"
+import Service from "../ddo/Service"
+import {Account, Logger, Ocean, ServiceAgreement} from "../squid"
+
+(async () => {
+    const ocean: Ocean = await Ocean.getInstance({
+        nodeUri: "http://localhost:8545",
+        aquariusUri: "http://localhost:5000",
+        brizoUri: "http://localhost:8030",
+        parityUri: "http://localhost:9545",
+        secretStoreUri: "http://localhost:12001",
+        threshold: 0,
+        password: "unittest",
+        address: "0xed243adfb84a6626eba46178ccb567481c6e655d",
+    })
+
+    const publisher: Account = (await ocean.getAccounts())[0]
+    const consumer: Account = (await ocean.getAccounts())[1]
+
+    const metaData = new MetaData({
+        base: {
+            name: "Office Humidity",
+            type: "dataset",
+            description: "Weather information of UK including temperature and humidity",
+            size: "3.1gb",
+            dateCreated: "2012-02-01T10:55:11+00:00",
+            author: "Met Office",
+            license: "CC-BY",
+            copyrightHolder: "Met Office",
+            encoding: "UTF-8",
+            compression: "zip",
+            contentType: "text/csv",
+            // tslint:disable-next-line
+            workExample: "stationId,latitude,longitude,datetime,temperature,humidity423432fsd,51.509865,-0.118092,2011-01-01T10:55:11+00:00,7.2,68",
+            contentUrls: [
+                "https://testocnfiles.blob.core.windows.net/testfiles/testzkp.zip",
+                "https://testocnfiles.blob.core.windows.net/testfiles/testzkp.zip",
+            ],
+            links: [
+                {sample1: "http://data.ceda.ac.uk/badc/ukcp09/data/gridded-land-obs/gridded-land-obs-daily/"},
+                {sample2: "http://data.ceda.ac.uk/badc/ukcp09/data/gridded-land-obs/gridded-land-obs-averages-25km/"},
+                {fieldsDescription: "http://data.ceda.ac.uk/badc/ukcp09/"},
+            ],
+            inLanguage: "en",
+            tags: "weather, uk, 2011, temperature, humidity",
+            price: 10,
+        } as MetaDataBase,
+    } as MetaData)
+
+    const ddo: DDO = await ocean.registerAsset(metaData, publisher)
+    Logger.log("did", ddo.id)
+    const assetId = ddo.id.replace("did:op:", "")
+
+    const accessService = ddo.findServiceByType("Access")
+
+    const serviceAgreementSignatureResult: any = await ocean.signServiceAgreement(ddo.id,
+        accessService.serviceDefinitionId, consumer)
+    Logger.log("ServiceAgreement Id:", serviceAgreementSignatureResult.serviceAgreementId)
+    Logger.log("ServiceAgreement Signature:", serviceAgreementSignatureResult.serviceAgreementSignature)
+
+    const service: Service = ddo.findServiceByType("Access")
+
+    const serviceAgreement: ServiceAgreement = await ocean.executeServiceAgreement(
+        ddo.id,
+        service.serviceDefinitionId,
+        serviceAgreementSignatureResult.serviceAgreementId,
+        serviceAgreementSignatureResult.serviceAgreementSignature,
+        consumer,
+        publisher)
+    Logger.log("ServiceAgreement Id:", serviceAgreement.getId())
+
+    await consumer.requestTokens(metaData.base.price)
+
+    const paid = await serviceAgreement.buyAsset(assetId, metaData.base.price, consumer)
+    Logger.log(`Asset paid: ${paid}`)
+})()
diff --git a/src/examples/GrantAccess.ts b/src/examples/GrantAccess.ts
new file mode 100644
index 0000000..269fa2d
--- /dev/null
+++ b/src/examples/GrantAccess.ts
@@ -0,0 +1,81 @@
+import DDO from "../ddo/DDO"
+import MetaData from "../ddo/MetaData"
+import MetaDataBase from "../ddo/MetaDataBase"
+import Service from "../ddo/Service"
+import {Account, Logger, Ocean, ServiceAgreement} from "../squid"
+
+(async () => {
+    const ocean: Ocean = await Ocean.getInstance({
+        nodeUri: "http://localhost:8545",
+        aquariusUri: "http://localhost:5000",
+        brizoUri: "http://localhost:8030",
+        parityUri: "http://localhost:9545",
+        secretStoreUri: "http://localhost:12001",
+        threshold: 0,
+        password: "unittest",
+        address: "0xed243adfb84a6626eba46178ccb567481c6e655d",
+    })
+
+    const publisher: Account = (await ocean.getAccounts())[0]
+    const consumer: Account = (await ocean.getAccounts())[1]
+
+    const metaData = new MetaData({
+        base: {
+            name: "Office Humidity",
+            type: "dataset",
+            description: "Weather information of UK including temperature and humidity",
+            size: "3.1gb",
+            dateCreated: "2012-02-01T10:55:11+00:00",
+            author: "Met Office",
+            license: "CC-BY",
+            copyrightHolder: "Met Office",
+            encoding: "UTF-8",
+            compression: "zip",
+            contentType: "text/csv",
+            // tslint:disable-next-line
+            workExample: "stationId,latitude,longitude,datetime,temperature,humidity423432fsd,51.509865,-0.118092,2011-01-01T10:55:11+00:00,7.2,68",
+            contentUrls: [
+                "https://testocnfiles.blob.core.windows.net/testfiles/testzkp.zip",
+                "https://testocnfiles.blob.core.windows.net/testfiles/testzkp.zip",
+            ],
+            links: [
+                {sample1: "http://data.ceda.ac.uk/badc/ukcp09/data/gridded-land-obs/gridded-land-obs-daily/"},
+                {sample2: "http://data.ceda.ac.uk/badc/ukcp09/data/gridded-land-obs/gridded-land-obs-averages-25km/"},
+                {fieldsDescription: "http://data.ceda.ac.uk/badc/ukcp09/"},
+            ],
+            inLanguage: "en",
+            tags: "weather, uk, 2011, temperature, humidity",
+            price: 10,
+        } as MetaDataBase,
+    } as MetaData)
+
+    const ddo: DDO = await ocean.registerAsset(metaData, publisher)
+    Logger.log("did", ddo.id)
+    const assetId = ddo.id.replace("did:op:", "")
+
+    const accessService = ddo.findServiceByType("Access")
+
+    const serviceAgreementSignatureResult: any = await ocean.signServiceAgreement(ddo.id,
+        accessService.serviceDefinitionId, consumer)
+    Logger.log("ServiceAgreement Id:", serviceAgreementSignatureResult.serviceAgreementId)
+    Logger.log("ServiceAgreement Signature:", serviceAgreementSignatureResult.serviceAgreementSignature)
+
+    const service: Service = ddo.findServiceByType("Access")
+
+    const serviceAgreement: ServiceAgreement = await ocean.executeServiceAgreement(
+        ddo.id,
+        service.serviceDefinitionId,
+        serviceAgreementSignatureResult.serviceAgreementId,
+        serviceAgreementSignatureResult.serviceAgreementSignature,
+        consumer,
+        publisher)
+    Logger.log("ServiceAgreement Id:", serviceAgreement.getId())
+
+    await consumer.requestTokens(metaData.base.price)
+
+    const paid = await serviceAgreement.buyAsset(assetId, metaData.base.price, consumer)
+    Logger.log(`Asset paid: ${paid}`)
+
+    const accessGranted = await serviceAgreement.grantAccess(assetId, assetId)
+    Logger.log(`Asset access granted: ${accessGranted}`)
+})()
diff --git a/src/examples/fire_lazers.sh b/src/examples/fire_lazers.sh
index f521131..2ace01f 100755
--- a/src/examples/fire_lazers.sh
+++ b/src/examples/fire_lazers.sh
@@ -7,3 +7,5 @@ npm run run src/examples/RegisterAsset.ts
 npm run run src/examples/Search.ts
 npm run run src/examples/SignAgreement.ts
 npm run run src/examples/ExecuteAgreement.ts
+npm run run src/examples/BuyAsset.ts
+npm run run src/examples/GrantAccess.ts
diff --git a/src/ocean/Ocean.ts b/src/ocean/Ocean.ts
index 4784da7..924e882 100644
--- a/src/ocean/Ocean.ts
+++ b/src/ocean/Ocean.ts
@@ -62,12 +62,12 @@ export default class Ocean {
         const aquarius = AquariusProvider.getAquarius()
         const brizo = BrizoProvider.getBrizo()
 
-        const id: string = IdGenerator.generateId()
-        const did: string = `did:op:${id}`
+        const assetId: string = IdGenerator.generateId()
+        const did: string = `did:op:${assetId}`
         const serviceDefinitionId: string = IdGenerator.generatePrefixedId()
 
         metadata.base.contentUrls =
-            await SecretStoreProvider.getSecretStore().encryptDocument(id, metadata.base.contentUrls)
+            await SecretStoreProvider.getSecretStore().encryptDocument(assetId, metadata.base.contentUrls)
 
         const template = new Access()
         const serviceAgreementTemplate = new ServiceAgreementTemplate(template)
@@ -98,9 +98,9 @@ export default class Ocean {
                         case "price":
                             return metadata.base.price
                         case "assetId":
-                            return "0x" + id
+                            return "0x" + assetId
                         case "documentKeyId":
-                            return "0x1234"
+                            return "0x" + assetId
                     }
 
                     return null
@@ -182,7 +182,7 @@ export default class Ocean {
         const storedDdo = await aquarius.storeDDO(ddo)
 
         await didRegistry.registerAttribute(
-            id,
+            assetId,
             ValueType.DID,
             "Metadata",
             serviceEndpoint,
diff --git a/src/ocean/ServiceAgreements/ServiceAgreement.ts b/src/ocean/ServiceAgreements/ServiceAgreement.ts
index 0f0302b..dba4bc6 100644
--- a/src/ocean/ServiceAgreements/ServiceAgreement.ts
+++ b/src/ocean/ServiceAgreements/ServiceAgreement.ts
@@ -205,6 +205,7 @@ export default class ServiceAgreement extends OceanBase {
         super(serviceAgreementId)
     }
 
+    // todo: sync with samer
     public async buyAsset(assetId: string, price: number, consumer: Account): Promise<boolean> {
         const {paymentConditions, token} = await Keeper.getInstance()