Custom square canvas

{"numberOfSets":2,"set1":{"title":"Select frame thickness","description":"","variants":[{"title":"18mm","id":1,"price":4.99,"template":25,"showsecondset":true,"relatedInSet2":[1,2,3,4,5,6]},{"title":"38mm","id":2,"price":52.95,"template":22310,"showsecondset":true,"relatedInSet2":[7,8,9,10]}]},"set2":{"title":"Select size","description":"","variants":[{"title":"12\"x12\"","id":1,"price":45.96,"template":26221},{"title":"16\"x16\"","id":2,"price":45.96,"template":26222},{"title":"20\"x20\"","id":3,"price":64.35,"template":26223},{"title":"24\"x24\"","id":4,"price":64.35,"template":26224},{"title":"30\"x30\"","id":5,"price":119.95,"template":26225},{"title":"34\"x34\"","id":6,"price":119.95,"template":26226},{"title":"12\"x12\"","id":7,"price":162,"template":26227},{"title":"16\"x16\"","id":8,"price":162,"template":26228},{"title":"24\"x24\"","id":9,"price":299.95,"template":26229},{"title":"34\"x34\"","id":10,"price":299.95,"template":26230}]}}