diff --git a/processor/src/commercetools/customFields.commercetools.ts b/processor/src/commercetools/customFields.commercetools.ts
index 3ee0586..7bd9e4e 100644
--- a/processor/src/commercetools/customFields.commercetools.ts
+++ b/processor/src/commercetools/customFields.commercetools.ts
@@ -299,3 +299,83 @@ export async function createCustomPaymentTransactionCancelReasonType(): Promise<
       .execute();
   }
 }
+
+export async function createTransactionSurchargeCustomType(): Promise<void> {
+  const apiRoot = createApiRoot();
+  const customFields: FieldDefinition[] = [
+    {
+      name: 'surchargeAmountInCent',
+      label: {
+        en: 'Total surcharge amount in cent',
+        de: 'Gesamtbetrag des Zuschlags in Cent',
+      },
+      required: false,
+      type: {
+        name: 'Number',
+      },
+      inputHint: 'MultiLine',
+    },
+  ];
+
+  const {
+    body: { results: types },
+  } = await apiRoot
+    .types()
+    .get({
+      queryArgs: {
+        where: `key = "${CustomFields.transactionSurchargeCost}"`,
+      },
+    })
+    .execute();
+
+  if (types.length <= 0) {
+    await apiRoot
+      .types()
+      .post({
+        body: {
+          key: CustomFields.createPayment.interfaceInteraction.key,
+          name: {
+            en: 'SCTM - Transaction surcharge amount',
+            de: 'SCTM - Betrag des Transaktionszuschlags',
+          },
+          resourceTypeIds: ['transaction'],
+          fieldDefinitions: customFields,
+        },
+      })
+      .execute();
+
+    return;
+  }
+
+  const type = types[0];
+  const definitions = type.fieldDefinitions;
+
+  if (definitions.length > 0) {
+    const actions: TypeUpdateAction[] = [];
+    definitions.forEach((definition) => {
+      actions.push({
+        action: 'removeFieldDefinition',
+        fieldName: definition.name,
+      });
+    });
+    customFields.forEach((field) => {
+      actions.push({
+        action: 'addFieldDefinition',
+        fieldDefinition: field,
+      });
+    });
+
+    await apiRoot
+      .types()
+      .withKey({ key: CustomFields.transactionSurchargeCost })
+      .post({
+        body: {
+          version: type.version,
+          actions,
+        },
+      })
+      .execute();
+
+    return;
+  }
+}
diff --git a/processor/src/service/connector.service.ts b/processor/src/service/connector.service.ts
index 9e9fd8d..f611771 100644
--- a/processor/src/service/connector.service.ts
+++ b/processor/src/service/connector.service.ts
@@ -3,12 +3,14 @@ import {
   createCustomPaymentType,
   createCustomPaymentInterfaceInteractionType,
   createCustomPaymentTransactionCancelReasonType,
+  createTransactionSurchargeCustomType,
 } from '../commercetools/customFields.commercetools';
 export const createExtensionAndCustomFields = async (extensionUrl: string): Promise<void> => {
   await createPaymentExtension(extensionUrl);
   await createCustomPaymentType();
   await createCustomPaymentInterfaceInteractionType();
   await createCustomPaymentTransactionCancelReasonType();
+  await createTransactionSurchargeCustomType();
 };
 
 export const removeExtension = async (): Promise<void> => {
diff --git a/processor/src/service/payment.service.ts b/processor/src/service/payment.service.ts
index ccdfad5..7ff0d01 100644
--- a/processor/src/service/payment.service.ts
+++ b/processor/src/service/payment.service.ts
@@ -54,7 +54,6 @@ import {
   changeTransactionState,
   changeTransactionTimestamp,
   setCustomFields,
-  setTransactionCustomField,
   setTransactionCustomType,
 } from '../commercetools/action.commercetools';
 import { readConfiguration } from '../utils/config.utils';
@@ -503,11 +502,9 @@ export const getCreatePaymentUpdateAction = async (
     if (surchargeAmountInCent > 0) {
       // Add surcharge amount to the custom field of the transaction
       actions.push(
-        setTransactionCustomField(
-          CustomFields.transactionSurchargeCost,
-          JSON.stringify({ surchargeAmountInCent }),
-          originalTransaction.id,
-        ),
+        setTransactionCustomType(originalTransaction.id, CustomFields.transactionSurchargeCost, {
+          surchargeAmountInCent,
+        }),
       );
     }
 
diff --git a/processor/tests/commercetools/action.commercetools.spec.ts b/processor/tests/commercetools/action.commercetools.spec.ts
index 3035ef1..1d2d9e5 100644
--- a/processor/tests/commercetools/action.commercetools.spec.ts
+++ b/processor/tests/commercetools/action.commercetools.spec.ts
@@ -1,4 +1,4 @@
-import { ConnectorActions, CustomFields, MOLLIE_SURCHARGE_CUSTOM_LINE_ITEM } from '../../src/utils/constant.utils';
+import { ConnectorActions, MOLLIE_SURCHARGE_CUSTOM_LINE_ITEM } from '../../src/utils/constant.utils';
 import { describe, test, expect, jest } from '@jest/globals';
 import {
   addCustomLineItem,
@@ -8,7 +8,6 @@ import {
   changeTransactionTimestamp,
   removeCustomLineItem,
   setCustomFields,
-  setTransactionCustomField,
   setTransactionCustomType,
 } from '../../src/commercetools/action.commercetools';
 import { CTTransactionState, CreateInterfaceInteractionParams } from '../../src/types/commercetools.types';
@@ -183,19 +182,4 @@ describe('Test actions.utils.ts', () => {
       slug,
     });
   });
-
-  test('should be able to return the correct setTransactionCustomField action', () => {
-    const name = CustomFields.transactionSurchargeCost;
-    const surchargeInCentAmount = {
-      surchargeInCentAmount: 12345,
-    };
-    const transactionId = 'test';
-
-    expect(setTransactionCustomField(name, JSON.stringify(surchargeInCentAmount), transactionId)).toStrictEqual({
-      action: 'setTransactionCustomField',
-      name,
-      value: JSON.stringify(surchargeInCentAmount),
-      transactionId,
-    });
-  });
 });
diff --git a/processor/tests/routes/processor.route.spec.ts b/processor/tests/routes/processor.route.spec.ts
index 768eb0d..d01c1d5 100644
--- a/processor/tests/routes/processor.route.spec.ts
+++ b/processor/tests/routes/processor.route.spec.ts
@@ -7,6 +7,7 @@ import {
   createCustomPaymentType,
   createCustomPaymentInterfaceInteractionType,
   createCustomPaymentTransactionCancelReasonType,
+  createTransactionSurchargeCustomType,
 } from '../../src/commercetools/customFields.commercetools';
 
 jest.mock('../../src/commercetools/extensions.commercetools', () => ({
@@ -18,6 +19,7 @@ jest.mock('../../src/commercetools/customFields.commercetools', () => ({
   createCustomPaymentType: jest.fn(),
   createCustomPaymentInterfaceInteractionType: jest.fn(),
   createCustomPaymentTransactionCancelReasonType: jest.fn(),
+  createTransactionSurchargeCustomType: jest.fn(),
 }));
 
 describe('Test src/route/processor.route.ts', () => {
@@ -109,6 +111,7 @@ describe('Test src/route/processor.route.ts', () => {
       (createCustomPaymentType as jest.Mock).mockReturnValueOnce(Promise.resolve());
       (createCustomPaymentInterfaceInteractionType as jest.Mock).mockReturnValueOnce(Promise.resolve());
       (createCustomPaymentTransactionCancelReasonType as jest.Mock).mockReturnValueOnce(Promise.resolve());
+      (createTransactionSurchargeCustomType as jest.Mock).mockReturnValueOnce(Promise.resolve());
 
       req = {
         hostname: 'test.com',
diff --git a/processor/tests/service/payment.service.spec.ts b/processor/tests/service/payment.service.spec.ts
index 27a5147..e51aeb9 100644
--- a/processor/tests/service/payment.service.spec.ts
+++ b/processor/tests/service/payment.service.spec.ts
@@ -1206,11 +1206,13 @@ describe('Test getCreatePaymentUpdateAction', () => {
     });
 
     expect(actual[4]).toEqual({
-      action: 'setTransactionCustomField',
-      name: CustomFieldName.transactionSurchargeCost,
-      value: JSON.stringify({
+      action: 'setTransactionCustomType',
+      type: {
+        key: 'sctm_transaction_surcharge_cost',
+      },
+      fields: {
         surchargeAmountInCent: 1000,
-      }),
+      },
       transactionId: CTPayment.transactions[0].id,
     });
   });
@@ -1421,12 +1423,14 @@ describe('Test handleCreatePayment', () => {
         state: 'Pending',
       },
       {
-        action: 'setTransactionCustomField',
-        name: 'sctm_transaction_surcharge_cost',
-        transactionId: '5c8b0375-305a-4f19-ae8e-07806b101999',
-        value: JSON.stringify({
-          surchargeAmountInCent: totalSurchargeAmount,
-        }),
+        action: 'setTransactionCustomType',
+        type: {
+          key: 'sctm_transaction_surcharge_cost',
+        },
+        fields: {
+          surchargeAmountInCent: 1020,
+        },
+        transactionId: CTPayment.transactions[0].id,
       },
     ];
 
@@ -1590,12 +1594,14 @@ describe('Test handleCreatePayment', () => {
         state: 'Pending',
       },
       {
-        action: 'setTransactionCustomField',
-        name: 'sctm_transaction_surcharge_cost',
-        transactionId: '5c8b0375-305a-4f19-ae8e-07806b101999',
-        value: JSON.stringify({
+        action: 'setTransactionCustomType',
+        type: {
+          key: 'sctm_transaction_surcharge_cost',
+        },
+        fields: {
           surchargeAmountInCent: totalSurchargeAmount,
-        }),
+        },
+        transactionId: CTPayment.transactions[0].id,
       },
     ];