diff --git a/ipfs-pinning-service.yaml b/ipfs-pinning-service.yaml
index 9127b1c..7b3c393 100644
--- a/ipfs-pinning-service.yaml
+++ b/ipfs-pinning-service.yaml
@@ -476,6 +476,7 @@ components:
         requestid:
           description: Globally unique identifier of the pin request; can be used to check the status of ongoing pinning, or pin removal
           type: string
+          format: uuid
           example: "UniqueIdOfPinRequest"
         status:
           $ref: '#/components/schemas/Status'
diff --git a/lib/IpfsUpload/Controller/Pins.pm b/lib/IpfsUpload/Controller/Pins.pm
index e76f84d..f6ebdc1 100644
--- a/lib/IpfsUpload/Controller/Pins.pm
+++ b/lib/IpfsUpload/Controller/Pins.pm
@@ -81,6 +81,152 @@ sub get($c) {
 	});
 }
 
+sub replace($c) {
+	$c->openapi->valid_input or return;
+	my $uid = $c->stash('uid');
+	my $id = $c->param('requestid');
+
+	my $body = $c->req->json;
+
+	my $cid = $body->{cid};
+	my $name = $body->{name};
+	my $origins = $body->{origins};
+	# No support for meta.
+
+	return $c->pins->get({
+		id => $id,
+	})->then(sub ($pin) {
+		if (!defined $pin) {
+			return $c->render(status => 404, openapi => {
+				error => {
+					reason  => "NOT_FOUND",
+					details => "The specified resource was not found",
+				},
+			});
+		}
+		if ($pin->{uid} ne $uid) {
+			return $c->render(status => 401, openapi => {
+				error => {
+					reason  => "UNAUTHORIZED",
+					details => "You cannot replace that pin.",
+				},
+			});
+		}
+
+		# Begin add process
+		my @requests;
+
+		push @requests, Mojo::Promise->resolve(1);
+
+		# Firstly try to direct to possible origins.
+		if (defined $origins) {
+			for my $origin (@$origins) {
+				my $url = Mojo::URL->new($c->config->{ipfs}->{gatewayWriteUrl});
+				$url->path("api/v0/swarm/peering/add");
+				$url->query({
+					arg => $origin,
+				});
+
+				push @requests, $c->ua->post_p($url);
+			}
+		}
+
+		Mojo::Promise->all_settled(@requests)->then(sub(@results) {
+			# I had to look at the sourcecode for this.
+			# my $peer_failed = 0;
+			# for my $res (@results) {
+			# 	if ($res->{status} eq 'fulfilled') {
+			# 		my $tx = $res->{value};
+			#
+			# 		# Handle first initial empty promise
+			# 		if ($tx == 1) {
+			# 			next;
+			# 		}
+			#
+			# 		if (!$tx->result->is_success) {
+			# 			say "Failure to add IPFS peer.";
+			# 			$peer_failed = 1;
+			# 			last;
+			# 		}
+			# 	} else {
+			# 		say "Failure to connect!";
+			# 		die $res->{reason};
+			# 	}
+			# }
+
+			my $url = Mojo::URL->new($c->config->{ipfs}->{gatewayWriteUrl});
+			$url->path("api/v0/pin/add");
+			$url->query({
+				arg       => $cid,
+				recursive => "true",
+				# It seems progress is a stream. Not sure how to handle that?
+				# Let's just assume it works immediately.
+				# TODO.
+				progress  => "false",
+			});
+
+			return $c->ua->post_p($url);
+		})->then(sub($tx) {
+			my $res = $tx->result;
+
+			if ($res->is_success) {
+				# Now we do DB stuff.
+				return $c->pins->update({
+					cid  => $cid,
+					name => $name,
+				}, {
+					id => $id,
+				});
+			} else {
+				# TODO: read error and use appropriate response
+				say $res->body;
+				die "Failed to pin.";
+			}
+		})->then(sub($res) {
+			if (!defined $res) {
+				die "DB Failure";
+			}
+
+			# Now do deletion of previous CID.
+			return $c->pins->cid_count($pin->{cid});
+		})->then(sub($count) {
+			# Zero this time, since we already replaced the DB entry.
+			say "Count: $count";
+			if ($count == 0) {
+				my $url = Mojo::URL->new($c->config->{ipfs}->{gatewayWriteUrl});
+				$url->path("api/v0/pin/rm");
+				$url->query({
+					arg       => $pin->{cid},
+					recursive => "true",
+				});
+
+				return $c->ua->post_p($url);
+			}
+
+			return 1;
+		})->then(sub($tx) {
+			if ($tx != 1) {
+				my $res = $tx->result;
+				if (!$res->is_success) {
+					die "Could not delete pin!";
+				}
+			}
+
+			return $c->render(openapi => {
+				requestid => $id,
+				# TODO
+				status    => "pinned",
+				created   => IpfsUpload::Util::date_format($pin->{created_at}),
+				pin       => {
+					cid  => $cid,
+					name => $name,
+				},
+				delegates => $c->config->{ipfs}->{delegates},
+			}, status => 202);
+		});
+	});
+}
+
 sub delete($c) {
 	$c->openapi->valid_input or return;
 	my $uid = $c->stash('uid');
diff --git a/lib/IpfsUpload/Model/Pins.pm b/lib/IpfsUpload/Model/Pins.pm
index 1f82729..758ab2a 100644
--- a/lib/IpfsUpload/Model/Pins.pm
+++ b/lib/IpfsUpload/Model/Pins.pm
@@ -23,6 +23,12 @@ sub get($self, $where) {
 	});
 }
 
+sub update($self, $update, $where) {
+	return $self->pg->db->update_p('pins', $update, $where, { returning => ['cid', 'id']})->then(sub ($res) {
+		return $res->hash;
+	});
+}
+
 sub cid_count($self, $cid) {
 	return $self->pg->db->select_p('pins', 'cid', {cid => $cid})->then(sub ($res) {
 		return $res->rows;