Added new constant for Data provider ID

src/main/java/org/genesys2/client/oauth/api/accession/Api1Constants.java

@@ -47,6 +47,11 @@ public interface Api1Constants {
 		 */
 		public static final String INSTCODE_NEW = "newInstituteCode";
 
+		/**
+		 * Data provider id.
+		 */
+		public static final String DATA_PROVIDER_ID = "dataProviderId";
+
 		/**
 		 * Accession number.
 		 */