diff --git a/.github/workflows/main.yaml b/.github/workflows/main.yaml
index 027a62bc..e06452f3 100644
--- a/.github/workflows/main.yaml
+++ b/.github/workflows/main.yaml
@@ -64,10 +64,12 @@ jobs:
           add_git_labels: true
           push: ${{ github.event_name != 'pull_request' }}
       - name: Log in to Azure
+        if: github.ref == 'refs/heads/main'
         uses: azure/login@v1.1
         with:
           creds: ${{ secrets.AZURE_CREDENTIALS }}
       - name: Deploy to Azure Webapps
+        if: github.ref == 'refs/heads/main'
         run: |
           shinycaas::az_webapp(
             plan = "hoad",
diff --git a/DESCRIPTION b/DESCRIPTION
index 5a22406e..02038561 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -20,6 +20,18 @@ Authors@R:
       person(
         given = "Göttingen State and University Library",
         role = c("cph", "fnd")
+      ),
+      person(
+        given = "German Research Foundation",
+        role = c("spn")
+      ),
+      person(
+        given = "Crossref",
+        role = c("dtc")
+      ),
+      person(
+        given = "OpenAPC Initiative",
+        role = c("dtc")
       )
     )
 Description: 
diff --git a/README.md b/README.md
index 679a0e51..ca9091b1 100644
--- a/README.md
+++ b/README.md
@@ -114,6 +114,8 @@ The compliance checker helps libraries and funders of open access publications s
 
 ## Data Sources
 
+<!-- TODO this should be replaced by proper metadata in pkgdown sidebar https://github.com/subugoe/metacheck/issues/39 -->
+
 - [Crossref REST API (Metadata Plus)](https://github.com/CrossRef/rest-api-doc)
 - [Open APC Initiative](https://openapc.net/)
 
@@ -129,4 +131,6 @@ The package includes:
 
 ## Funding acknowledgement
 
+<!-- TODO this should be replaced by proper metadata in pkgdown sidebar https://github.com/subugoe/metacheck/issues/39 -->
+
 This scholarly communication analytics services is supported by the [Deutsche Forschungsgemeinschaft](https://gepris.dfg.de/gepris/projekt/416115939).
diff --git a/man/figures/dfg_logo_schriftzug_blau_foerderung_en.jpg b/man/figures/dfg_logo_schriftzug_blau_foerderung_en.jpg
new file mode 100644
index 00000000..42c516f1
Binary files /dev/null and b/man/figures/dfg_logo_schriftzug_blau_foerderung_en.jpg differ
diff --git a/man/figures/metadata-from-crossref-logo-200.svg b/man/figures/metadata-from-crossref-logo-200.svg
new file mode 100644
index 00000000..da00bfba
--- /dev/null
+++ b/man/figures/metadata-from-crossref-logo-200.svg
@@ -0,0 +1,82 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Generator: Adobe Illustrator 19.2.1, SVG Export Plug-In . SVG Version: 6.00 Build 0)  -->
+<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
+<svg version="1.1" id="Layer_1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px"
+	 viewBox="0 0 200 67.9" style="enable-background:new 0 0 200 67.9;" xml:space="preserve">
+<style type="text/css">
+	.st0{fill:#4F5859;}
+	.st1{fill:#3DB0C7;}
+	.st2{fill:#D6D0C3;}
+	.st3{fill:#FCC62E;}
+	.st4{fill:#E63642;}
+</style>
+<g>
+	<g>
+		<g>
+			<g>
+				<g>
+					<path class="st0" d="M76.1,37.5c-0.4-2.6-2.9-4.6-5.8-4.6c-5.2,0-7.2,4.4-7.2,9.1c0,4.4,2,8.9,7.2,8.9c3.6,0,5.6-2.4,6-5.9H82
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+</g>
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+		c0-2.9,1.9-5.4,4.9-5.4c3.2,0,5.2,2.9,4.8,5.9H78.4z M83.7,13.5c-0.1-1.4-1-2.7-2.5-2.7c-1.5,0-2.6,1.2-2.7,2.7H83.7z"/>
+	<path class="st0" d="M86.1,9.3h1.7v-3H90v3h2V11h-2v5.4c0,0.9,0.1,1.4,1.1,1.4c0.3,0,0.6,0,0.9-0.1v1.7c-0.5,0-1,0.1-1.5,0.1
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diff --git a/man/figures/openAPC_01+.png b/man/figures/openAPC_01+.png
new file mode 100644
index 00000000..f7c35951
Binary files /dev/null and b/man/figures/openAPC_01+.png differ
diff --git a/man/metacheck-package.Rd b/man/metacheck-package.Rd
index fb798afe..0cf9c336 100644
--- a/man/metacheck-package.Rd
+++ b/man/metacheck-package.Rd
@@ -29,6 +29,9 @@ Authors:
 Other contributors:
 \itemize{
   \item Göttingen State and University Library [copyright holder, funder]
+  \item German Research Foundation [sponsor]
+  \item Crossref [data contributor]
+  \item OpenAPC Initiative [data contributor]
 }
 
 }
diff --git a/pkgdown/_pkgdown.yml b/pkgdown/_pkgdown.yml
index 738406f1..3e0d1088 100644
--- a/pkgdown/_pkgdown.yml
+++ b/pkgdown/_pkgdown.yml
@@ -5,6 +5,15 @@ authors:
     href: https://www.maxheld.de
   Göttingen State and University Library:
     href: https://www.sub.uni-goettingen.de/
+  German Research Foundation:
+    href: https://www.dfg.de
+    html: <img src="reference/figures/dfg_logo_schriftzug_blau_foerderung_en.jpg" height="15">
+  Crossref:
+    href: https://www.crossref.org
+    html: <img src="reference/figures/metadata-from-crossref-logo-200.svg" height="15">
+  OpenAPC Initiative:
+    href: https://github.com/openapc
+    html: <img src="reference/figures/openAPC_01+.png" height="15">
 template:
   package: subugoetheme
 home: