diff --git a/src/main/python/ddadevops/domain/credentials.py b/src/main/python/ddadevops/domain/credentials.py
index c5ab6a9..f144394 100644
--- a/src/main/python/ddadevops/domain/credentials.py
+++ b/src/main/python/ddadevops/domain/credentials.py
@@ -34,23 +34,30 @@ class CredentialMapping(Validateable):
 
     def name_for_input(self):
         if self.name:
-            return self.name
+            result = self.name
+        elif self.gopass_field:
+            result = underscore(self.gopass_field)
         else:
-            return underscore(self.gopass_field)
+            result = ""
+        return result
 
     def name_for_environment(self):
         return self.name_for_input().upper()
 
 
 class Credentials(Validateable):
-    def __init__(self, input: dict):
+    def __init__(self, input: dict, default_mappings: list = []):
         input_mappings = input.get("credentials_mapping", [])
-        self.mappings = []
+        self.mappings = {}
+        for input_mapping in default_mappings:
+            mapping = CredentialMapping(input_mapping)
+            self.mappings[mapping.name_for_input()] = mapping
         for input_mapping in input_mappings:
-            self.mappings.append(CredentialMapping(input_mapping))
+            mapping = CredentialMapping(input_mapping)
+            self.mappings[mapping.name_for_input()] = mapping
 
     def validate(self) -> List[str]:
         result = []
-        for mapping in self.mappings:
+        for mapping in self.mappings.values():
             result += mapping.validate()
         return result
diff --git a/src/main/python/ddadevops/domain/credentials_service.py b/src/main/python/ddadevops/domain/credentials_service.py
new file mode 100644
index 0000000..67fb633
--- /dev/null
+++ b/src/main/python/ddadevops/domain/credentials_service.py
@@ -0,0 +1,28 @@
+from pathlib import Path
+from .common import Devops, MixinType
+from .devops_factory import DevopsFactory
+from .version import Version
+from src.main.python.ddadevops.infrastructure import (
+    BuildFileRepository    
+)
+
+class CredentialsService:
+    def __init__(self, gopass_api, environment_api):
+        
+    @classmethod
+    def prod(cls):
+        return cls(
+            DevopsFactory(),
+            BuildFileRepository(base_dir),
+        )
+    
+    def initialize(self, input: dict) -> Devops: 
+        mixin_types = self.devops_factory.__parse_mixin_types__(input["mixin_types"])
+        version = None
+
+        if MixinType.RELEASE in mixin_types:
+            primary_build_file_id = input.get("release_primary_build_file", "./project.clj")
+            primary_build_file = self.build_file_repository.get(Path(primary_build_file_id))
+            version = primary_build_file.get_version()
+
+        return self.devops_factory.build_devops(input, version=version)
diff --git a/src/main/python/ddadevops/domain/devops_factory.py b/src/main/python/ddadevops/domain/devops_factory.py
index ae7c097..afeb58d 100644
--- a/src/main/python/ddadevops/domain/devops_factory.py
+++ b/src/main/python/ddadevops/domain/devops_factory.py
@@ -37,7 +37,7 @@ class DevopsFactory:
                         "name": "grafana_cloud_password",
                     }
                 ]
-            mixins[MixinType.CREDENTIALS] = Credentials(input, version)
+            mixins[MixinType.CREDENTIALS] = Credentials(input, default_mappings)
 
         devops = Devops(input, specialized_builds=specialized_builds, mixins=mixins)
 
diff --git a/src/main/python/ddadevops/infrastructure/infrastructure.py b/src/main/python/ddadevops/infrastructure/infrastructure.py
index 1b50682..4406e8a 100644
--- a/src/main/python/ddadevops/infrastructure/infrastructure.py
+++ b/src/main/python/ddadevops/infrastructure/infrastructure.py
@@ -99,3 +99,8 @@ class ExecutionApi:
             output = execute(command, True)
             print(output)
         return output
+
+class EnvironmentApi():
+
+    def get(self, key):
+        return environ.get(key)
diff --git a/src/test/python/domain/test_crededntials.py b/src/test/python/domain/test_crededntials.py
index 5ca2171..4e817ff 100644
--- a/src/test/python/domain/test_crededntials.py
+++ b/src/test/python/domain/test_crededntials.py
@@ -71,8 +71,53 @@ def test_should_create_credentials():
             ],
         }
     )
+    assert sut
+    assert 2 == len(sut.mappings)
+
+    sut = Credentials(
+        {},
+        default_mappings=[
+            {
+                "gopass_path": "server/meissa/grafana-cloud",
+                "gopass_field": "grafana-cloud-user",
+            },
+            {
+                "gopass_path": "server/meissa/grafana-cloud",
+                "name": "grafana_cloud_password",
+            },
+        ],
+    )
+    assert sut
+    assert 2 == len(sut.mappings)
 
+    sut = Credentials(
+        {
+            "credentials_mapping": [
+                {
+                    "gopass_path": "dome/path",
+                    "gopass_field": "some-field",
+                },
+                {
+                    "gopass_path": "another_path",
+                    "name": "grafana_cloud_password",
+                },
+            ],
+        },
+        default_mappings=[
+            {
+                "gopass_path": "server/meissa/grafana-cloud",
+                "gopass_field": "grafana-cloud-user",
+            },
+            {
+                "gopass_path": "server/meissa/grafana-cloud",
+                "name": "grafana_cloud_password",
+            },
+        ],
+    )
     assert sut
+    assert 3 == len(sut.mappings)
+    assert sut.mappings["grafana_cloud_password"].gopass_path == "another_path"
+
 
 def test_should_validate_credentials():
     sut = Credentials(
@@ -98,9 +143,7 @@ def test_should_validate_credentials():
                     "gopass_path": "server/meissa/grafana-cloud",
                     "gopass_field": "grafana-cloud-user",
                 },
-                {
-                    "gopass_path": "server/meissa/grafana-cloud"
-                },
+                {"gopass_path": "server/meissa/grafana-cloud"},
             ],
         }
     )