diff --git a/CHANGELOG.md b/CHANGELOG.md
index 39f2a2b0..83df4164 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -11,6 +11,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - Added support for the (optional) `accountId` in the import functionality for activities
 - Added support for the (optional) `dataSource` in the import functionality for activities
+- Added support for the data source transformation
 - Added support for the cryptocurrency _Mina Protocol_ (`MINA-USD`)
 
 ### Changed
@@ -18,6 +19,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Improved the consistent use of `symbol` in combination with `dataSource`
 - Removed the primary data source from the client
 
+### Removed
+
+- Removed the unused endpoint `GET api/order/:id`
+
 ## 1.108.0 - 27.01.2022
 
 ### Changed
diff --git a/apps/api/src/app/order/order.controller.ts b/apps/api/src/app/order/order.controller.ts
index 3d315a84..58a043b8 100644
--- a/apps/api/src/app/order/order.controller.ts
+++ b/apps/api/src/app/order/order.controller.ts
@@ -1,5 +1,7 @@
 import { UserService } from '@ghostfolio/api/app/user/user.service';
 import { nullifyValuesInObjects } from '@ghostfolio/api/helper/object.helper';
+import { TransformDataSourceInRequestInterceptor } from '@ghostfolio/api/interceptors/transform-data-source-in-request.interceptor';
+import { TransformDataSourceInResponseInterceptor } from '@ghostfolio/api/interceptors/transform-data-source-in-response.interceptor';
 import { ImpersonationService } from '@ghostfolio/api/services/impersonation.service';
 import { hasPermission, permissions } from '@ghostfolio/common/permissions';
 import type { RequestWithUser } from '@ghostfolio/common/types';
@@ -14,7 +16,8 @@ import {
   Param,
   Post,
   Put,
-  UseGuards
+  UseGuards,
+  UseInterceptors
 } from '@nestjs/common';
 import { REQUEST } from '@nestjs/core';
 import { AuthGuard } from '@nestjs/passport';
@@ -58,6 +61,7 @@ export class OrderController {
 
   @Get()
   @UseGuards(AuthGuard('jwt'))
+  @UseInterceptors(TransformDataSourceInResponseInterceptor)
   public async getAllOrders(
     @Headers('impersonation-id') impersonationId
   ): Promise<Activities> {
@@ -91,19 +95,9 @@ export class OrderController {
     return { activities };
   }
 
-  @Get(':id')
-  @UseGuards(AuthGuard('jwt'))
-  public async getOrderById(@Param('id') id: string): Promise<OrderModel> {
-    return this.orderService.order({
-      id_userId: {
-        id,
-        userId: this.request.user.id
-      }
-    });
-  }
-
   @Post()
   @UseGuards(AuthGuard('jwt'))
+  @UseInterceptors(TransformDataSourceInRequestInterceptor)
   public async createOrder(@Body() data: CreateOrderDto): Promise<OrderModel> {
     if (
       !hasPermission(this.request.user.permissions, permissions.createOrder)
@@ -138,6 +132,7 @@ export class OrderController {
 
   @Put(':id')
   @UseGuards(AuthGuard('jwt'))
+  @UseInterceptors(TransformDataSourceInRequestInterceptor)
   public async update(@Param('id') id: string, @Body() data: UpdateOrderDto) {
     if (
       !hasPermission(this.request.user.permissions, permissions.updateOrder)
diff --git a/apps/api/src/app/portfolio/portfolio.controller.ts b/apps/api/src/app/portfolio/portfolio.controller.ts
index 0cb0fb61..6a2351a4 100644
--- a/apps/api/src/app/portfolio/portfolio.controller.ts
+++ b/apps/api/src/app/portfolio/portfolio.controller.ts
@@ -4,9 +4,12 @@ import {
   hasNotDefinedValuesInObject,
   nullifyValuesInObject
 } from '@ghostfolio/api/helper/object.helper';
+import { TransformDataSourceInRequestInterceptor } from '@ghostfolio/api/interceptors/transform-data-source-in-request.interceptor';
+import { TransformDataSourceInResponseInterceptor } from '@ghostfolio/api/interceptors/transform-data-source-in-response.interceptor';
 import { ConfigurationService } from '@ghostfolio/api/services/configuration.service';
 import { ExchangeRateDataService } from '@ghostfolio/api/services/exchange-rate-data.service';
 import { baseCurrency } from '@ghostfolio/common/config';
+import { parseDate } from '@ghostfolio/common/helper';
 import {
   PortfolioChart,
   PortfolioDetails,
@@ -25,13 +28,11 @@ import {
   Inject,
   Param,
   Query,
-  Res,
-  UseGuards
+  UseGuards,
+  UseInterceptors
 } from '@nestjs/common';
 import { REQUEST } from '@nestjs/core';
 import { AuthGuard } from '@nestjs/passport';
-import { DataSource } from '@prisma/client';
-import { Response } from 'express';
 import { StatusCodes, getReasonPhrase } from 'http-status-codes';
 
 import { PortfolioPositionDetail } from './interfaces/portfolio-position-detail.interface';
@@ -53,8 +54,7 @@ export class PortfolioController {
   @UseGuards(AuthGuard('jwt'))
   public async getChart(
     @Headers('impersonation-id') impersonationId: string,
-    @Query('range') range,
-    @Res() res: Response
+    @Query('range') range
   ): Promise<PortfolioChart> {
     const historicalDataContainer = await this.portfolioServiceStrategy
       .get()
@@ -90,27 +90,29 @@ export class PortfolioController {
       });
     }
 
-    return <any>res.json({
+    return {
       hasError,
       chart: chartData,
       isAllTimeHigh: historicalDataContainer.isAllTimeHigh,
       isAllTimeLow: historicalDataContainer.isAllTimeLow
-    });
+    };
   }
 
   @Get('details')
   @UseGuards(AuthGuard('jwt'))
+  @UseInterceptors(TransformDataSourceInResponseInterceptor)
   public async getDetails(
     @Headers('impersonation-id') impersonationId: string,
-    @Query('range') range,
-    @Res() res: Response
-  ): Promise<PortfolioDetails> {
+    @Query('range') range
+  ): Promise<PortfolioDetails & { hasError: boolean }> {
     if (
       this.configurationService.get('ENABLE_FEATURE_SUBSCRIPTION') &&
       this.request.user.subscription.type === 'Basic'
     ) {
-      res.status(StatusCodes.FORBIDDEN);
-      return <any>res.json({ accounts: {}, holdings: {} });
+      throw new HttpException(
+        getReasonPhrase(StatusCodes.FORBIDDEN),
+        StatusCodes.FORBIDDEN
+      );
     }
 
     let hasError = false;
@@ -159,21 +161,22 @@ export class PortfolioController {
       }
     }
 
-    return <any>res.json({ accounts, hasError, holdings });
+    return { accounts, hasError, holdings };
   }
 
   @Get('investments')
   @UseGuards(AuthGuard('jwt'))
   public async getInvestments(
-    @Headers('impersonation-id') impersonationId: string,
-    @Res() res: Response
+    @Headers('impersonation-id') impersonationId: string
   ): Promise<PortfolioInvestments> {
     if (
       this.configurationService.get('ENABLE_FEATURE_SUBSCRIPTION') &&
       this.request.user.subscription.type === 'Basic'
     ) {
-      res.status(StatusCodes.FORBIDDEN);
-      return <any>res.json({});
+      throw new HttpException(
+        getReasonPhrase(StatusCodes.FORBIDDEN),
+        StatusCodes.FORBIDDEN
+      );
     }
 
     let investments = await this.portfolioServiceStrategy
@@ -195,15 +198,14 @@ export class PortfolioController {
       }));
     }
 
-    return <any>res.json({ firstOrderDate: investments[0]?.date, investments });
+    return { firstOrderDate: parseDate(investments[0]?.date), investments };
   }
 
   @Get('performance')
   @UseGuards(AuthGuard('jwt'))
   public async getPerformance(
     @Headers('impersonation-id') impersonationId: string,
-    @Query('range') range,
-    @Res() res: Response
+    @Query('range') range
   ): Promise<{ hasErrors: boolean; performance: PortfolioPerformance }> {
     const performanceInformation = await this.portfolioServiceStrategy
       .get()
@@ -219,15 +221,15 @@ export class PortfolioController {
       );
     }
 
-    return <any>res.json(performanceInformation);
+    return performanceInformation;
   }
 
   @Get('positions')
   @UseGuards(AuthGuard('jwt'))
+  @UseInterceptors(TransformDataSourceInResponseInterceptor)
   public async getPositions(
     @Headers('impersonation-id') impersonationId: string,
-    @Query('range') range,
-    @Res() res: Response
+    @Query('range') range
   ): Promise<PortfolioPositions> {
     const result = await this.portfolioServiceStrategy
       .get()
@@ -247,13 +249,12 @@ export class PortfolioController {
       });
     }
 
-    return <any>res.json(result);
+    return result;
   }
 
   @Get('public/:accessId')
   public async getPublic(
-    @Param('accessId') accessId,
-    @Res() res: Response
+    @Param('accessId') accessId
   ): Promise<PortfolioPublicDetails> {
     const access = await this.accessService.access({ id: accessId });
     const user = await this.userService.user({
@@ -261,8 +262,10 @@ export class PortfolioController {
     });
 
     if (!access) {
-      res.status(StatusCodes.NOT_FOUND);
-      return <any>res.json({ accounts: {}, holdings: {} });
+      throw new HttpException(
+        getReasonPhrase(StatusCodes.NOT_FOUND),
+        StatusCodes.NOT_FOUND
+      );
     }
 
     let hasDetails = true;
@@ -305,7 +308,7 @@ export class PortfolioController {
       }
     }
 
-    return <any>res.json(portfolioPublicDetails);
+    return portfolioPublicDetails;
   }
 
   @Get('summary')
@@ -339,6 +342,7 @@ export class PortfolioController {
   }
 
   @Get('position/:dataSource/:symbol')
+  @UseInterceptors(TransformDataSourceInRequestInterceptor)
   @UseGuards(AuthGuard('jwt'))
   public async getPosition(
     @Headers('impersonation-id') impersonationId: string,
@@ -376,21 +380,18 @@ export class PortfolioController {
   @Get('report')
   @UseGuards(AuthGuard('jwt'))
   public async getReport(
-    @Headers('impersonation-id') impersonationId: string,
-    @Res() res: Response
+    @Headers('impersonation-id') impersonationId: string
   ): Promise<PortfolioReport> {
     if (
       this.configurationService.get('ENABLE_FEATURE_SUBSCRIPTION') &&
       this.request.user.subscription.type === 'Basic'
     ) {
-      res.status(StatusCodes.FORBIDDEN);
-      return <any>res.json({ rules: [] });
+      throw new HttpException(
+        getReasonPhrase(StatusCodes.FORBIDDEN),
+        StatusCodes.FORBIDDEN
+      );
     }
 
-    return <any>(
-      res.json(
-        await this.portfolioServiceStrategy.get().getReport(impersonationId)
-      )
-    );
+    return await this.portfolioServiceStrategy.get().getReport(impersonationId);
   }
 }
diff --git a/apps/api/src/app/subscription/subscription.controller.ts b/apps/api/src/app/subscription/subscription.controller.ts
index 531e798b..1f68c8f7 100644
--- a/apps/api/src/app/subscription/subscription.controller.ts
+++ b/apps/api/src/app/subscription/subscription.controller.ts
@@ -7,6 +7,7 @@ import {
   Body,
   Controller,
   Get,
+  HttpCode,
   HttpException,
   Inject,
   Logger,
@@ -17,7 +18,6 @@ import {
 } from '@nestjs/common';
 import { REQUEST } from '@nestjs/core';
 import { AuthGuard } from '@nestjs/passport';
-import { Response } from 'express';
 import { StatusCodes, getReasonPhrase } from 'http-status-codes';
 
 import { SubscriptionService } from './subscription.service';
@@ -32,11 +32,9 @@ export class SubscriptionController {
   ) {}
 
   @Post('redeem-coupon')
+  @HttpCode(StatusCodes.OK)
   @UseGuards(AuthGuard('jwt'))
-  public async redeemCoupon(
-    @Body() { couponCode }: { couponCode: string },
-    @Res() res: Response
-  ) {
+  public async redeemCoupon(@Body() { couponCode }: { couponCode: string }) {
     if (!this.request.user) {
       throw new HttpException(
         getReasonPhrase(StatusCodes.FORBIDDEN),
@@ -74,12 +72,10 @@ export class SubscriptionController {
       `Subscription for user '${this.request.user.id}' has been created with coupon`
     );
 
-    res.status(StatusCodes.OK);
-
-    return <any>res.json({
+    return {
       message: getReasonPhrase(StatusCodes.OK),
       statusCode: StatusCodes.OK
-    });
+    };
   }
 
   @Get('stripe/callback')
diff --git a/apps/api/src/app/symbol/symbol.controller.ts b/apps/api/src/app/symbol/symbol.controller.ts
index d81ba5ca..5b3c0f03 100644
--- a/apps/api/src/app/symbol/symbol.controller.ts
+++ b/apps/api/src/app/symbol/symbol.controller.ts
@@ -1,3 +1,5 @@
+import { TransformDataSourceInRequestInterceptor } from '@ghostfolio/api/interceptors/transform-data-source-in-request.interceptor';
+import { TransformDataSourceInResponseInterceptor } from '@ghostfolio/api/interceptors/transform-data-source-in-response.interceptor';
 import { IDataProviderHistoricalResponse } from '@ghostfolio/api/services/interfaces/interfaces';
 import {
   Controller,
@@ -5,7 +7,8 @@ import {
   HttpException,
   Param,
   Query,
-  UseGuards
+  UseGuards,
+  UseInterceptors
 } from '@nestjs/common';
 import { AuthGuard } from '@nestjs/passport';
 import { DataSource } from '@prisma/client';
@@ -25,6 +28,7 @@ export class SymbolController {
    */
   @Get('lookup')
   @UseGuards(AuthGuard('jwt'))
+  @UseInterceptors(TransformDataSourceInResponseInterceptor)
   public async lookupSymbol(
     @Query() { query = '' }
   ): Promise<{ items: LookupItem[] }> {
@@ -43,6 +47,8 @@ export class SymbolController {
    */
   @Get(':dataSource/:symbol')
   @UseGuards(AuthGuard('jwt'))
+  @UseInterceptors(TransformDataSourceInRequestInterceptor)
+  @UseInterceptors(TransformDataSourceInResponseInterceptor)
   public async getSymbolData(
     @Param('dataSource') dataSource: DataSource,
     @Param('symbol') symbol: string,
diff --git a/apps/api/src/interceptors/transform-data-source-in-request.interceptor.ts b/apps/api/src/interceptors/transform-data-source-in-request.interceptor.ts
new file mode 100644
index 00000000..27bbe047
--- /dev/null
+++ b/apps/api/src/interceptors/transform-data-source-in-request.interceptor.ts
@@ -0,0 +1,45 @@
+import {
+  CallHandler,
+  ExecutionContext,
+  Injectable,
+  NestInterceptor
+} from '@nestjs/common';
+import { Observable } from 'rxjs';
+import { ConfigurationService } from '../services/configuration.service';
+
+@Injectable()
+export class TransformDataSourceInRequestInterceptor<T>
+  implements NestInterceptor<T, any>
+{
+  public constructor(
+    private readonly configurationService: ConfigurationService
+  ) {}
+
+  public intercept(
+    context: ExecutionContext,
+    next: CallHandler<T>
+  ): Observable<any> {
+    const http = context.switchToHttp();
+    const request = http.getRequest();
+
+    if (this.configurationService.get('ENABLE_FEATURE_SUBSCRIPTION') === true) {
+      if (request.body.dataSource) {
+        request.body.dataSource = this.decodeDataSource(
+          request.body.dataSource
+        );
+      }
+
+      if (request.params.dataSource) {
+        request.params.dataSource = this.decodeDataSource(
+          request.params.dataSource
+        );
+      }
+    }
+
+    return next.handle();
+  }
+
+  private decodeDataSource(encodeDataSource: string) {
+    return Buffer.from(encodeDataSource, 'hex').toString();
+  }
+}
diff --git a/apps/api/src/interceptors/transform-data-source-in-response.interceptor.ts b/apps/api/src/interceptors/transform-data-source-in-response.interceptor.ts
new file mode 100644
index 00000000..4f7d641a
--- /dev/null
+++ b/apps/api/src/interceptors/transform-data-source-in-response.interceptor.ts
@@ -0,0 +1,76 @@
+import {
+  CallHandler,
+  ExecutionContext,
+  Injectable,
+  NestInterceptor
+} from '@nestjs/common';
+import { DataSource } from '@prisma/client';
+import { Observable } from 'rxjs';
+import { map } from 'rxjs/operators';
+import { ConfigurationService } from '../services/configuration.service';
+
+@Injectable()
+export class TransformDataSourceInResponseInterceptor<T>
+  implements NestInterceptor<T, any>
+{
+  public constructor(
+    private readonly configurationService: ConfigurationService
+  ) {}
+
+  public intercept(
+    context: ExecutionContext,
+    next: CallHandler<T>
+  ): Observable<any> {
+    return next.handle().pipe(
+      map((data: any) => {
+        if (
+          this.configurationService.get('ENABLE_FEATURE_SUBSCRIPTION') === true
+        ) {
+          if (data.activities) {
+            data.activities.map((activity) => {
+              activity.SymbolProfile.dataSource = this.encodeDataSource(
+                activity.SymbolProfile.dataSource
+              );
+              activity.dataSource = this.encodeDataSource(activity.dataSource);
+              return activity;
+            });
+          }
+
+          if (data.dataSource) {
+            data.dataSource = this.encodeDataSource(data.dataSource);
+          }
+
+          if (data.holdings) {
+            for (const symbol of Object.keys(data.holdings)) {
+              if (data.holdings[symbol].dataSource) {
+                data.holdings[symbol].dataSource = this.encodeDataSource(
+                  data.holdings[symbol].dataSource
+                );
+              }
+            }
+          }
+
+          if (data.items) {
+            data.items.map((item) => {
+              item.dataSource = this.encodeDataSource(item.dataSource);
+              return item;
+            });
+          }
+
+          if (data.positions) {
+            data.positions.map((position) => {
+              position.dataSource = this.encodeDataSource(position.dataSource);
+              return position;
+            });
+          }
+        }
+
+        return data;
+      })
+    );
+  }
+
+  private encodeDataSource(aDataSource: DataSource) {
+    return Buffer.from(aDataSource, 'utf-8').toString('hex');
+  }
+}