try manually paging

membership/src/main/java/de/bstly/we/membership/businesslogic/MembershipManager.java

@@ -717,6 +717,19 @@ public class MembershipManager {
 	 */
 	protected List<JsonObject> fetchAllOrderPositions(String path, MultiValueMap<String, String> queryParams,
 			List<JsonObject> result) {
+		return fetchAllOrderPositions(path, queryParams, result, 1);
+	}
+
+	/**
+	 * Fetch all order positions.
+	 *
+	 * @param path        the path
+	 * @param queryParams the query params
+	 * @param result      the result
+	 * @return the list
+	 */
+	protected List<JsonObject> fetchAllOrderPositions(String path, MultiValueMap<String, String> queryParams,
+			List<JsonObject> result, int page) {
 		JsonElement response = pretixManager.request(path, HttpMethod.GET, queryParams);
 
 		if (response == null) {
@@ -732,7 +745,10 @@ public class MembershipManager {
 		}
 
 		if (orderPositions.has("next") && !orderPositions.get("next").isJsonNull()) {
-			return fetchAllOrderPositions(orderPositions.get("next").getAsString(), new LinkedMultiValueMap<String, String>(), result);
+			page += 1;
+			queryParams.remove("page");
+			queryParams.set("page", String.valueOf(page));
+			return fetchAllOrderPositions(path, queryParams, result, page);
 		}
 
 		logger.debug("results: " + result.size() + " ? " + queryParams.getFirst("item"));