diff --git a/docs/docs.go b/docs/docs.go
index 31d4529..44ca8fa 100644
--- a/docs/docs.go
+++ b/docs/docs.go
@@ -42,6 +42,33 @@ const docTemplate = `{
                 "responses": {}
             }
         },
+        "/certificates": {
+            "post": {
+                "description": "Generate certificates based on the provided data",
+                "consumes": [
+                    "application/json"
+                ],
+                "produces": [
+                    "application/pdf"
+                ],
+                "tags": [
+                    "certificates"
+                ],
+                "summary": "Generate runner certificates",
+                "parameters": [
+                    {
+                        "description": "Certificate data",
+                        "name": "data",
+                        "in": "body",
+                        "required": true,
+                        "schema": {
+                            "$ref": "#/definitions/models.CertificateRequest"
+                        }
+                    }
+                ],
+                "responses": {}
+            }
+        },
         "/contracts": {
             "post": {
                 "description": "Generate a contract based on the provided data",
@@ -106,6 +133,24 @@ const docTemplate = `{
                 }
             }
         },
+        "models.CertificateRequest": {
+            "type": "object",
+            "properties": {
+                "locale": {
+                    "type": "string",
+                    "enum": [
+                        "en",
+                        "de"
+                    ]
+                },
+                "runners": {
+                    "type": "array",
+                    "items": {
+                        "$ref": "#/definitions/models.RunnerWithDonations"
+                    }
+                }
+            }
+        },
         "models.ContractRequest": {
             "type": "object",
             "properties": {
@@ -124,6 +169,43 @@ const docTemplate = `{
                 }
             }
         },
+        "models.DistanceDonation": {
+            "type": "object",
+            "properties": {
+                "amount": {
+                    "type": "integer"
+                },
+                "amount_per_distance": {
+                    "type": "integer"
+                },
+                "donor": {
+                    "$ref": "#/definitions/models.Donor"
+                },
+                "id": {
+                    "type": "integer"
+                },
+                "paid_amount": {
+                    "type": "integer"
+                }
+            }
+        },
+        "models.Donor": {
+            "type": "object",
+            "properties": {
+                "first_name": {
+                    "type": "string"
+                },
+                "id": {
+                    "type": "integer"
+                },
+                "last_name": {
+                    "type": "string"
+                },
+                "middle_name": {
+                    "type": "string"
+                }
+            }
+        },
         "models.Group": {
             "type": "object",
             "properties": {
@@ -157,6 +239,41 @@ const docTemplate = `{
                     "type": "string"
                 }
             }
+        },
+        "models.RunnerWithDonations": {
+            "type": "object",
+            "properties": {
+                "distance": {
+                    "type": "integer"
+                },
+                "distance_donations": {
+                    "type": "array",
+                    "items": {
+                        "$ref": "#/definitions/models.DistanceDonation"
+                    }
+                },
+                "first_name": {
+                    "type": "string"
+                },
+                "group": {
+                    "$ref": "#/definitions/models.Group"
+                },
+                "id": {
+                    "type": "integer"
+                },
+                "last_name": {
+                    "type": "string"
+                },
+                "middle_name": {
+                    "type": "string"
+                },
+                "total_donations": {
+                    "type": "integer"
+                },
+                "total_per_distance": {
+                    "type": "integer"
+                }
+            }
         }
     }
 }`
diff --git a/docs/swagger.json b/docs/swagger.json
index bf54e83..0402190 100644
--- a/docs/swagger.json
+++ b/docs/swagger.json
@@ -33,6 +33,33 @@
                 "responses": {}
             }
         },
+        "/certificates": {
+            "post": {
+                "description": "Generate certificates based on the provided data",
+                "consumes": [
+                    "application/json"
+                ],
+                "produces": [
+                    "application/pdf"
+                ],
+                "tags": [
+                    "certificates"
+                ],
+                "summary": "Generate runner certificates",
+                "parameters": [
+                    {
+                        "description": "Certificate data",
+                        "name": "data",
+                        "in": "body",
+                        "required": true,
+                        "schema": {
+                            "$ref": "#/definitions/models.CertificateRequest"
+                        }
+                    }
+                ],
+                "responses": {}
+            }
+        },
         "/contracts": {
             "post": {
                 "description": "Generate a contract based on the provided data",
@@ -97,6 +124,24 @@
                 }
             }
         },
+        "models.CertificateRequest": {
+            "type": "object",
+            "properties": {
+                "locale": {
+                    "type": "string",
+                    "enum": [
+                        "en",
+                        "de"
+                    ]
+                },
+                "runners": {
+                    "type": "array",
+                    "items": {
+                        "$ref": "#/definitions/models.RunnerWithDonations"
+                    }
+                }
+            }
+        },
         "models.ContractRequest": {
             "type": "object",
             "properties": {
@@ -115,6 +160,43 @@
                 }
             }
         },
+        "models.DistanceDonation": {
+            "type": "object",
+            "properties": {
+                "amount": {
+                    "type": "integer"
+                },
+                "amount_per_distance": {
+                    "type": "integer"
+                },
+                "donor": {
+                    "$ref": "#/definitions/models.Donor"
+                },
+                "id": {
+                    "type": "integer"
+                },
+                "paid_amount": {
+                    "type": "integer"
+                }
+            }
+        },
+        "models.Donor": {
+            "type": "object",
+            "properties": {
+                "first_name": {
+                    "type": "string"
+                },
+                "id": {
+                    "type": "integer"
+                },
+                "last_name": {
+                    "type": "string"
+                },
+                "middle_name": {
+                    "type": "string"
+                }
+            }
+        },
         "models.Group": {
             "type": "object",
             "properties": {
@@ -148,6 +230,41 @@
                     "type": "string"
                 }
             }
+        },
+        "models.RunnerWithDonations": {
+            "type": "object",
+            "properties": {
+                "distance": {
+                    "type": "integer"
+                },
+                "distance_donations": {
+                    "type": "array",
+                    "items": {
+                        "$ref": "#/definitions/models.DistanceDonation"
+                    }
+                },
+                "first_name": {
+                    "type": "string"
+                },
+                "group": {
+                    "$ref": "#/definitions/models.Group"
+                },
+                "id": {
+                    "type": "integer"
+                },
+                "last_name": {
+                    "type": "string"
+                },
+                "middle_name": {
+                    "type": "string"
+                },
+                "total_donations": {
+                    "type": "integer"
+                },
+                "total_per_distance": {
+                    "type": "integer"
+                }
+            }
         }
     }
 }
\ No newline at end of file
diff --git a/docs/swagger.yaml b/docs/swagger.yaml
index bb39e12..8e7b232 100644
--- a/docs/swagger.yaml
+++ b/docs/swagger.yaml
@@ -22,6 +22,18 @@ definitions:
         - de
         type: string
     type: object
+  models.CertificateRequest:
+    properties:
+      locale:
+        enum:
+        - en
+        - de
+        type: string
+      runners:
+        items:
+          $ref: '#/definitions/models.RunnerWithDonations'
+        type: array
+    type: object
   models.ContractRequest:
     properties:
       locale:
@@ -34,6 +46,30 @@ definitions:
           $ref: '#/definitions/models.Runner'
         type: array
     type: object
+  models.DistanceDonation:
+    properties:
+      amount:
+        type: integer
+      amount_per_distance:
+        type: integer
+      donor:
+        $ref: '#/definitions/models.Donor'
+      id:
+        type: integer
+      paid_amount:
+        type: integer
+    type: object
+  models.Donor:
+    properties:
+      first_name:
+        type: string
+      id:
+        type: integer
+      last_name:
+        type: string
+      middle_name:
+        type: string
+    type: object
   models.Group:
     properties:
       id:
@@ -56,6 +92,29 @@ definitions:
       middle_name:
         type: string
     type: object
+  models.RunnerWithDonations:
+    properties:
+      distance:
+        type: integer
+      distance_donations:
+        items:
+          $ref: '#/definitions/models.DistanceDonation'
+        type: array
+      first_name:
+        type: string
+      group:
+        $ref: '#/definitions/models.Group'
+      id:
+        type: integer
+      last_name:
+        type: string
+      middle_name:
+        type: string
+      total_donations:
+        type: integer
+      total_per_distance:
+        type: integer
+    type: object
 info:
   contact: {}
   description: This is the API documentation for the LfK Document Server - a tool
@@ -80,6 +139,24 @@ paths:
       summary: Generate runner cards
       tags:
       - cards
+  /certificates:
+    post:
+      consumes:
+      - application/json
+      description: Generate certificates based on the provided data
+      parameters:
+      - description: Certificate data
+        in: body
+        name: data
+        required: true
+        schema:
+          $ref: '#/definitions/models.CertificateRequest'
+      produces:
+      - application/pdf
+      responses: {}
+      summary: Generate runner certificates
+      tags:
+      - certificates
   /contracts:
     post:
       consumes: