PDFGeneratorAPI::ConvertHTML2PDFRequestPropertiesNameTypeDescriptionNotescontentStringHTML content[optional]paper_sizeStringPDF page size[optional][default to 'a4']orientationString[optional][default to 'portrait']outputStringOutput[optional][default to 'base64']filenameStringDocument name[optional]Examplerequire'pdf_generator_api_client'instance=PDFGeneratorAPI::ConvertHTML2PDFRequest.new(content: <html><title>Test</title><body><h1>Hello world</h1></body></html>,paper_size: a4,orientation: portrait,output: base64,filename: Invoice12345)