diff --git a/app/commands/posts/create_checkin.rb b/app/commands/posts/create_checkin.rb
new file mode 100644
index 0000000..5f63793
--- /dev/null
+++ b/app/commands/posts/create_checkin.rb
@@ -0,0 +1,40 @@
+require "dry/monads"
+
+module Adamantium
+  module Commands
+    module Posts
+      class CreateCheckin < Command
+        include Deps["repos.post_repo",
+          "post_utilities.slugify",
+          renderer: "renderers.markdown",
+          add_post_syndication_source: "commands.posts.add_syndication_source"
+                    ]
+
+        include Dry::Monads[:result]
+
+        def call(post)
+          post_params = prepare_params(params: post)
+          created_post = post_repo.create(post_params)
+
+          post_params[:syndication_sources].each do |url|
+            add_post_syndication_source.call(created_post.id, :swarm, url)
+          end
+
+          # decorated_post = Decorators::Posts::Decorator.new(created_post)
+
+          # send_webmentions.call(post_content: attrs[:content], post_url: decorated_post.permalink)
+
+          Success(created_post)
+        end
+
+        private
+
+        def prepare_params(params:)
+          attrs = params.to_h
+          attrs[:content] = renderer.call(content: attrs[:content])
+          attrs
+        end
+      end
+    end
+  end
+end
diff --git a/app/commands/posts/creation_resolver.rb b/app/commands/posts/creation_resolver.rb
index 36a1de7..b236d0d 100644
--- a/app/commands/posts/creation_resolver.rb
+++ b/app/commands/posts/creation_resolver.rb
@@ -5,14 +5,18 @@ module Adamantium
         include Deps[
           "validation.posts.post_contract",
           "validation.posts.bookmark_contract",
+          "validation.posts.checkin_contract",
           "commands.posts.create_entry",
-          "commands.posts.create_bookmark"
+          "commands.posts.create_bookmark",
+          "commands.posts.create_checkin"
                ]
 
         def call(entry_type:)
           case entry_type
           in Entities::BookmarkRequest
             {command: create_bookmark, validation: bookmark_contract}
+          in Entities::CheckinRequest
+            {command: create_checkin, validation: checkin_contract}
           else
             {command: create_entry, validation: post_contract}
           end
diff --git a/app/entities/checkin_request.rb b/app/entities/checkin_request.rb
new file mode 100644
index 0000000..979b94c
--- /dev/null
+++ b/app/entities/checkin_request.rb
@@ -0,0 +1,17 @@
+module Adamantium
+  module Entities
+    class CheckinRequest < Dry::Struct
+      attribute :h, Types::Coercible::String
+      attribute :name, Types::Coercible::String.optional
+      attribute :content, Types::Coercible::String.optional
+      attribute :slug, Types::Coercible::String
+      attribute :url, Types::Coercible::String
+      attribute :category, Types::Array.of(Types::Coercible::String)
+      attribute :published_at, Types::Nominal::DateTime.optional
+      attribute :post_type, Types::Coercible::String
+      attribute :syndication_sources, Types::Array.of(Types::Coercible::String)
+      attribute :photos, Types::Array.of(Types::Hash)
+      attribute :location, Types::Coercible::String
+    end
+  end
+end
diff --git a/app/templates/shared/_post.html.slim b/app/templates/shared/_post.html.slim
index d1bf5e6..3b0b5e4 100644
--- a/app/templates/shared/_post.html.slim
+++ b/app/templates/shared/_post.html.slim
@@ -2,7 +2,7 @@ div class="mb-8 h-entry"
   h3 class="text-xl font-semibold text-blue-600 mb-2"
     a class="u-url border-b-2 border-transparent hover:border-blue-600 hover:border-b-2" href="/post/#{post.slug}"
       = post.display_title
-  div class="e-content p-name text-base prose prose-ul:list-none prose-ul:pl-0 prose-li:pl-0  text-gray-800 dark:text-gray-200"
+  div class="e-content p-name text-base prose prose-ul:list-none prose-ul:pl-0 prose-li:pl-0 text-gray-800 dark:text-gray-200 prose-a:dark:text-gray-100"
     == post.excerpt
     -if post.location
       img class="rounded" src=post.small_map
diff --git a/app/validation/posts/checkin_contract.rb b/app/validation/posts/checkin_contract.rb
new file mode 100644
index 0000000..e6ecaa2
--- /dev/null
+++ b/app/validation/posts/checkin_contract.rb
@@ -0,0 +1,19 @@
+module Adamantium
+  module Validation
+    module Posts
+      class CheckinContract < Dry::Validation::Contract
+        params do
+          required(:name).maybe(:string)
+          required(:content).filled(:string)
+          required(:category).array(:string)
+          required(:published_at).maybe(:time)
+          required(:slug).filled(:string)
+          required(:post_type).value(included_in?: %w[checkin])
+          required(:syndication_sources).array(:string)
+          required(:photos).array(:hash)
+          required(:location).maybe(:string)
+        end
+      end
+    end
+  end
+end
diff --git a/lib/adamantium/micropub_request_parser.rb b/lib/adamantium/micropub_request_parser.rb
index 3120fcf..7fc5613 100644
--- a/lib/adamantium/micropub_request_parser.rb
+++ b/lib/adamantium/micropub_request_parser.rb
@@ -5,12 +5,18 @@ module Adamantium
 
       cont_type = content_type(params)
       req_type = request_type(params)
-      req_params = parse_params(req_type, cont_type, params)
 
       if cont_type == :bookmark
+        req_params = parse_post_params(req_type, cont_type, params)
         return Entities::BookmarkRequest.new(req_params)
       end
 
+      if cont_type == :checkin
+        checkin_params = parse_checkin_params(params)
+        return Entities::CheckinRequest.new(checkin_params)
+      end
+
+      req_params = parse_post_params(req_type, cont_type, params)
       Entities::PostRequest.new(req_params)
     end
 
@@ -18,6 +24,7 @@ module Adamantium
 
     def content_type(params)
       return :bookmark if params[:"bookmark-of"]
+      return :checkin if params.dig(:properties, :checkin)
       :post
     end
 
@@ -33,7 +40,7 @@ module Adamantium
       nil
     end
 
-    def parse_params(req_type, post_type, params)
+    def parse_post_params(req_type, post_type, params)
       new_params = {}
       new_params[:h] = "entry"
       new_params[:post_type] = post_type
@@ -56,7 +63,13 @@ module Adamantium
         new_params[:slug] = params[:slug] || params["mp-slug"]
         new_params[:published_at] = (params[:"post-status"] == "draft") ? nil : publish_time
         new_params[:category] = params[:category] || []
-        new_params[:photos] = params[:photo] || []
+        new_params[:photos] = if params[:photo].is_a?(String)
+          {value: params[:photo], alt: ""}
+        elsif params[:photo].nil?
+          []
+        else
+          params[:photo]
+        end
         new_params[:location] = params[:location]
 
         content = if params[:content]
@@ -74,5 +87,24 @@ module Adamantium
 
       new_params
     end
+
+    def parse_checkin_params(params)
+      new_params = {}
+
+      checkin = params.dig(:properties, :checkin).first
+      new_params[:h] = "entry"
+      new_params[:syndication_sources] = params.dig(:properties, :syndication)
+      new_params[:name] = checkin.dig(:properties, :name).first
+      new_params[:content] = params.dig(:properties, :content)&.first
+      new_params[:url] = checkin.dig(:properties, :url)&.first
+      new_params[:slug] = SecureRandom.uuid
+      new_params[:category] = params.dig(:properties, :category)
+      new_params[:published_at] = params.dig(:properties, :published)&.first
+      new_params[:post_type] = :checkin
+      location = params.dig(:properties, :location).first[:properties]
+      new_params[:photos] = []
+      new_params[:location] = "geo:#{location.dig(:latitude).first},#{location.dig(:longitude).first};u=0"
+      new_params
+    end
   end
 end
diff --git a/spec/adamantium/micropub_request_parser_spec.rb b/spec/adamantium/micropub_request_parser_spec.rb
index 28ad74a..8d1e112 100644
--- a/spec/adamantium/micropub_request_parser_spec.rb
+++ b/spec/adamantium/micropub_request_parser_spec.rb
@@ -42,4 +42,106 @@ RSpec.describe Adamantium::MicropubRequestParser do
       end
     end
   end
+
+  context "checkin request" do
+    let(:params) {
+      json = '{
+    "type": [
+        "h-entry"
+    ],
+    "properties": {
+        "published": [
+            "2023-02-25T10:24:30+11:00"
+        ],
+        "syndication": [
+            "https://www.swarmapp.com/user/1390949/checkin/63f9472ed36fa977ac188903"
+        ],
+        "content": [
+            "Coffee time!!"
+        ],
+        "category": [
+            "check-in"
+        ],
+        "checkin": [
+            {
+                "type": [
+                    "h-card"
+                ],
+                "properties": {
+                    "name": [
+                        "St Rose"
+                    ],
+                    "url": [
+                        "https://foursquare.com/v/527da837498e9d7fee64bb75",
+                        "http://www.strose.com.au"
+                    ],
+                    "tel": [
+                        "(03) 9331 4488"
+                    ],
+                    "latitude": [
+                        -37.75627
+                    ],
+                    "longitude": [
+                        144.91555
+                    ],
+                    "street-address": [
+                        "19 Rose St"
+                    ],
+                    "locality": [
+                        "Essendon"
+                    ],
+                    "region": [
+                        "VIC"
+                    ],
+                    "country-name": [
+                        "Australia"
+                    ],
+                    "postal-code": [
+                        "3040"
+                    ]
+                },
+                "value": "https://foursquare.com/v/527da837498e9d7fee64bb75"
+            }
+        ],
+        "location": [
+            {
+                "type": [
+                    "h-adr"
+                ],
+                "properties": {
+                    "latitude": [
+                        -37.75627
+                    ],
+                    "longitude": [
+                        144.91555
+                    ],
+                    "street-address": [
+                        "19 Rose St"
+                    ],
+                    "locality": [
+                        "Essendon"
+                    ],
+                    "region": [
+                        "VIC"
+                    ],
+                    "country-name": [
+                        "Australia"
+                    ],
+                    "postal-code": [
+                        "3040"
+                    ]
+                }
+            }
+        ]
+    }
+}'
+      JSON.parse(json, symbolize_names: true)
+    }
+    it "parses the request" do
+      Timecop.freeze do
+        result = subject.call(params: params)
+        expect(result).to be_a Adamantium::Entities::CheckinRequest
+      end
+    end
+  end
 end
diff --git a/spec/requests/create_post_spec.rb b/spec/requests/create_post_spec.rb
index 8093898..57243e4 100644
--- a/spec/requests/create_post_spec.rb
+++ b/spec/requests/create_post_spec.rb
@@ -58,4 +58,21 @@ RSpec.describe "Post creation", :db, :requests do
       expect(post_repo.bookmark_listing.count).to eq 1
     end
   end
+
+  context "auth" do
+    it "does not allow multiple auth methods" do
+      params = {
+        access_token: "foo"
+      }
+
+      headers = {
+        HTTP_AUTHORIZATION: "Bearer foo",
+        CONTENT_TYPE: "application/json"
+      }
+
+      post "/micropub", params.to_json, headers
+
+      expect(last_response.status).to eq 400
+    end
+  end
 end