diff --git a/lib/pact_broker/api/contracts/publish_contracts_schema.rb b/lib/pact_broker/api/contracts/publish_contracts_schema.rb
index a2dd42682..3b45849f9 100644
--- a/lib/pact_broker/api/contracts/publish_contracts_schema.rb
+++ b/lib/pact_broker/api/contracts/publish_contracts_schema.rb
@@ -29,7 +29,7 @@ class PublishContractsSchema
             required(:content).filled(:str?)
             required(:contentType).filled(included_in?: ["application/json"])
             required(:specification).filled(included_in?: ["pact"])
-            optional(:writeMode).filled(included_in?:["overwrite", "merge"])
+            optional(:onConflict).filled(included_in?:["overwrite", "merge"])
           end
         end
 
diff --git a/lib/pact_broker/api/decorators/publish_contract_decorator.rb b/lib/pact_broker/api/decorators/publish_contract_decorator.rb
index 1bbbaf311..096ec4f34 100644
--- a/lib/pact_broker/api/decorators/publish_contract_decorator.rb
+++ b/lib/pact_broker/api/decorators/publish_contract_decorator.rb
@@ -12,7 +12,7 @@ class PublishContractDecorator < BaseDecorator
         property :specification
         property :content_type
         property :decoded_content
-        property :write_mode, default: "overwrite"
+        property :on_conflict, default: "overwrite"
       end
     end
   end
diff --git a/lib/pact_broker/contracts/contract_to_publish.rb b/lib/pact_broker/contracts/contract_to_publish.rb
index 223beaafa..f6367842d 100644
--- a/lib/pact_broker/contracts/contract_to_publish.rb
+++ b/lib/pact_broker/contracts/contract_to_publish.rb
@@ -1,8 +1,8 @@
 module PactBroker
   module Contracts
-    ContractToPublish = Struct.new(:consumer_name, :provider_name, :decoded_content, :content_type, :specification, :write_mode) do
-      def self.from_hash(consumer_name: nil, provider_name: nil, decoded_content: nil, content_type: nil, specification: nil, write_mode: nil)
-        new(consumer_name, provider_name, decoded_content, content_type, specification, write_mode)
+    ContractToPublish = Struct.new(:consumer_name, :provider_name, :decoded_content, :content_type, :specification, :on_conflict) do
+      def self.from_hash(consumer_name: nil, provider_name: nil, decoded_content: nil, content_type: nil, specification: nil, on_conflict: nil)
+        new(consumer_name, provider_name, decoded_content, content_type, specification, on_conflict)
       end
 
       def pact?
@@ -10,7 +10,7 @@ def pact?
       end
 
       def merge?
-        write_mode == "merge"
+        on_conflict == "merge"
       end
     end
   end
diff --git a/lib/pact_broker/doc/views/index/publish-contracts.markdown b/lib/pact_broker/doc/views/index/publish-contracts.markdown
index cd4c83d6e..41c86bf8a 100644
--- a/lib/pact_broker/doc/views/index/publish-contracts.markdown
+++ b/lib/pact_broker/doc/views/index/publish-contracts.markdown
@@ -20,7 +20,7 @@ The previous tag and pact endpoints are still supported, however, future feature
   * `specification`: currently, only contracts of type "pact" are supported, but this will be extended in the future. Required.
   * `contentType`: currently, only contracts with a content type of "application/json" are supported. Required.
   * `content`: the content of the contract. Must be Base64 encoded. Required.
-  * `writeMode`: Allowed values are `overwrite`|`merge`. Optional. Defaults to `overwrite`. When `merge` is specified, the interactions are merged into any pre-existing pact for the same consumer/provider/consumer version. This is required when the tests that generate pact files are split over multiple nodes.
+  * `onConflict`: Specifies the action to take when a contract for this consumer version already exists with different content. Allowed values are `overwrite`|`merge`. Optional. Defaults to `overwrite`. When `merge` is specified, the interactions are merged into any pre-existing pact. This is required when the tests that generate pact files are split over multiple nodes.
 
 ## Example
 
@@ -38,7 +38,7 @@ The previous tag and pact endpoints are still supported, however, future feature
           "specification": "pact",
           "contentType": "application/json",
           "content": "<base64 encoded JSON pact>",
-          "writeMode": "overwrite"
+          "onConflict": "overwrite"
         }
       ]
     }
diff --git a/spec/features/publish_pact_all_in_one_approval_spec.rb b/spec/features/publish_pact_all_in_one_approval_spec.rb
index 300089fc2..7adea8318 100644
--- a/spec/features/publish_pact_all_in_one_approval_spec.rb
+++ b/spec/features/publish_pact_all_in_one_approval_spec.rb
@@ -14,7 +14,7 @@
           :specification => "pact",
           :contentType => "application/json",
           :content => encoded_contract,
-          :writeMode => "overwrite",
+          :onConflict => "overwrite",
         }
       ]
     }
diff --git a/spec/features/publish_pact_all_in_one_spec.rb b/spec/features/publish_pact_all_in_one_spec.rb
index 33dc52506..a91a03ec5 100644
--- a/spec/features/publish_pact_all_in_one_spec.rb
+++ b/spec/features/publish_pact_all_in_one_spec.rb
@@ -14,7 +14,7 @@
           :specification => "pact",
           :contentType => "application/json",
           :content => encoded_contract,
-          :writeMode => "overwrite",
+          :onConflict => "overwrite",
         }
       ]
     }
diff --git a/spec/fixtures/approvals/publish_contract_no_branch.approved.json b/spec/fixtures/approvals/publish_contract_no_branch.approved.json
index 98c2abb3d..101951124 100644
--- a/spec/fixtures/approvals/publish_contract_no_branch.approved.json
+++ b/spec/fixtures/approvals/publish_contract_no_branch.approved.json
@@ -21,7 +21,7 @@
           "specification": "pact",
           "contentType": "application/json",
           "content": "eyJjb25zdW1lciI6eyJuYW1lIjoiRm9vIn0sInByb3ZpZGVyIjp7Im5hbWUiOiJCYXIifSwiaW50ZXJhY3Rpb25zIjpbXX0=",
-          "writeMode": "overwrite"
+          "onConflict": "overwrite"
         }
       ]
     }
diff --git a/spec/fixtures/approvals/publish_contract_nothing_exists.approved.json b/spec/fixtures/approvals/publish_contract_nothing_exists.approved.json
index bf41fb2ba..4d43f43ea 100644
--- a/spec/fixtures/approvals/publish_contract_nothing_exists.approved.json
+++ b/spec/fixtures/approvals/publish_contract_nothing_exists.approved.json
@@ -21,7 +21,7 @@
           "specification": "pact",
           "contentType": "application/json",
           "content": "eyJjb25zdW1lciI6eyJuYW1lIjoiRm9vIn0sInByb3ZpZGVyIjp7Im5hbWUiOiJCYXIifSwiaW50ZXJhY3Rpb25zIjpbXX0=",
-          "writeMode": "overwrite"
+          "onConflict": "overwrite"
         }
       ]
     }
diff --git a/spec/fixtures/approvals/publish_contract_nothing_exists_with_webhook.approved.json b/spec/fixtures/approvals/publish_contract_nothing_exists_with_webhook.approved.json
index 5fa949773..f7e6f5651 100644
--- a/spec/fixtures/approvals/publish_contract_nothing_exists_with_webhook.approved.json
+++ b/spec/fixtures/approvals/publish_contract_nothing_exists_with_webhook.approved.json
@@ -21,7 +21,7 @@
           "specification": "pact",
           "contentType": "application/json",
           "content": "eyJjb25zdW1lciI6eyJuYW1lIjoiRm9vIn0sInByb3ZpZGVyIjp7Im5hbWUiOiJCYXIifSwiaW50ZXJhY3Rpb25zIjpbXX0=",
-          "writeMode": "overwrite"
+          "onConflict": "overwrite"
         }
       ]
     }
diff --git a/spec/fixtures/approvals/publish_contract_verification_already_exists.approved.json b/spec/fixtures/approvals/publish_contract_verification_already_exists.approved.json
index c5865d2f0..573f2bede 100644
--- a/spec/fixtures/approvals/publish_contract_verification_already_exists.approved.json
+++ b/spec/fixtures/approvals/publish_contract_verification_already_exists.approved.json
@@ -21,7 +21,7 @@
           "specification": "pact",
           "contentType": "application/json",
           "content": "eyJjb25zdW1lciI6eyJuYW1lIjoiRm9vIn0sInByb3ZpZGVyIjp7Im5hbWUiOiJCYXIifSwiaW50ZXJhY3Rpb25zIjpbXX0=",
-          "writeMode": "overwrite"
+          "onConflict": "overwrite"
         }
       ]
     }
diff --git a/spec/fixtures/approvals/publish_contract_with_validation_error.approved.json b/spec/fixtures/approvals/publish_contract_with_validation_error.approved.json
index b10cd72a7..cdc8e68a7 100644
--- a/spec/fixtures/approvals/publish_contract_with_validation_error.approved.json
+++ b/spec/fixtures/approvals/publish_contract_with_validation_error.approved.json
@@ -20,7 +20,7 @@
           "specification": "pact",
           "contentType": "application/json",
           "content": "eyJjb25zdW1lciI6eyJuYW1lIjoiRm9vIn0sInByb3ZpZGVyIjp7Im5hbWUiOiJCYXIifSwiaW50ZXJhY3Rpb25zIjpbXX0=",
-          "writeMode": "overwrite"
+          "onConflict": "overwrite"
         }
       ]
     }
diff --git a/spec/lib/pact_broker/contracts/service_spec.rb b/spec/lib/pact_broker/contracts/service_spec.rb
index 2795b873b..62dcea298 100644
--- a/spec/lib/pact_broker/contracts/service_spec.rb
+++ b/spec/lib/pact_broker/contracts/service_spec.rb
@@ -14,7 +14,7 @@ module Contracts
           )
         end
 
-        let(:write_mode) { "overwrite" }
+        let(:on_conflict) { "overwrite" }
         let(:branch) { "main" }
         let(:contracts) { [contract_1] }
         let(:contract_1) do
@@ -23,7 +23,7 @@ module Contracts
             provider_name: "Bar",
             decoded_content: decoded_contract,
             specification: "pact",
-            write_mode: write_mode
+            on_conflict: on_conflict
           )
         end
 
@@ -54,7 +54,7 @@ module Contracts
           end
 
           context "when the write mode is merge" do
-            let(:write_mode) { "merge" }
+            let(:on_conflict) { "merge" }
 
             it "returns an info message" do
               expect(subject.notices.find{ |log| log.type == "success" && log.text.include?(" published ") }).to_not be nil
@@ -95,7 +95,7 @@ module Contracts
           end
 
           context "when the write mode is merge" do
-            let(:write_mode) { "merge" }
+            let(:on_conflict) { "merge" }
 
             it "returns an info message" do
               expect(subject.notices.find{ |log| log.type == "success" && log.text.include?("merged") }).to_not be nil