diff --git a/packages/backend/src/entity/Deployment.ts b/packages/backend/src/entity/Deployment.ts
index 5efb28b4..cf0889e8 100644
--- a/packages/backend/src/entity/Deployment.ts
+++ b/packages/backend/src/entity/Deployment.ts
@@ -38,6 +38,7 @@ export interface ApplicationDeploymentRequest {
   auction?: string;
   config: string;
   meta: string;
+  payment: string;
 }
 
 export interface ApplicationDeploymentRemovalRequest {
diff --git a/packages/backend/src/registry.ts b/packages/backend/src/registry.ts
index 9f3b314c..3e35d779 100644
--- a/packages/backend/src/registry.ts
+++ b/packages/backend/src/registry.ts
@@ -248,6 +248,7 @@ export class Registry {
     lrn: string,
     environmentVariables: { [key: string]: string },
     dns: string,
+    payment: string
   }): Promise<{
     applicationDeploymentRequestId: string;
     applicationDeploymentRequestData: ApplicationDeploymentRequest;
@@ -267,6 +268,7 @@ export class Registry {
       name: `${applicationRecord.attributes.name}@${applicationRecord.attributes.app_version}`,
       application: `${lrn}@${applicationRecord.attributes.app_version}`,
       dns: data.dns,
+      payment: data.payment,
 
       // https://git.vdb.to/cerc-io/laconic-registry-cli/commit/129019105dfb93bebcea02fde0ed64d0f8e5983b
       config: JSON.stringify({
diff --git a/packages/backend/src/service.ts b/packages/backend/src/service.ts
index e697b663..b5c57cf5 100644
--- a/packages/backend/src/service.ts
+++ b/packages/backend/src/service.ts
@@ -648,7 +648,8 @@ export class Service {
         repository: repoUrl,
         environmentVariables: environmentVariablesObj,
         dns: `${newDeployment.project.name}`,
-        lrn: deployer!.deployerLrn!
+        lrn: deployer!.deployerLrn!,
+        payment: data.project.txHash!
       });
     }
 
@@ -660,6 +661,7 @@ export class Service {
         lrn: deployer!.deployerLrn!,
         environmentVariables: environmentVariablesObj,
         dns: `${newDeployment.project.name}-${newDeployment.id}`,
+        payment: data.project.txHash!
       });
 
     await this.db.updateDeploymentById(newDeployment.id, {
@@ -725,6 +727,7 @@ export class Service {
         dns: `${newDeployment.project.name}`,
         auctionId: project.auctionId!,
         lrn: deployerLrn,
+        payment: project.txHash!
       });
     }
 
@@ -738,6 +741,7 @@ export class Service {
         lrn: deployerLrn,
         environmentVariables: environmentVariablesObj,
         dns: `${newDeployment.project.name}-${newDeployment.id}`,
+        payment: project.txHash!
       });
 
     await this.db.updateDeploymentById(newDeployment.id, {
@@ -1342,12 +1346,13 @@ export class Service {
     }
 
     const auction = await this.getAuctionData(project.auctionId);
+    const maxPrice = Number(auction.maxPrice.quantity) * auction.numProviders;
 
     let amountToBeReturned;
     if (winningDeployersPresent) {
-      amountToBeReturned = auction.winnerPrice * auction.numProviders;
+      amountToBeReturned = maxPrice - auction.winnerAddresses.length * Number(auction.winnerPrice.quantity);
     } else {
-      amountToBeReturned = auction.maxPrice * auction.numProviders;
+      amountToBeReturned = maxPrice;
     }
 
     await this.laconicRegistry.sendTokensToAccount(