v.buffer
Creates a buffer around vector features of given type. 
Vector (v.*)
QgsProcessingParameterFeatureSource|input|Input vector layer|-1|None|False
QgsProcessingParameterString|cats|Category values|None|False|True
QgsProcessingParameterString|where|WHERE conditions of SQL statement without 'where' keyword|None|True|True
QgsProcessingParameterEnum|type|Input feature type|point;line;boundary;centroid;area|True|0,1,4|True
QgsProcessingParameterNumber|distance|Buffer distance in map units|QgsProcessingParameterNumber.Double|None|True|None|None
QgsProcessingParameterNumber|minordistance|Buffer distance along minor axis in map units|QgsProcessingParameterNumber.Double|None|True|None|None
QgsProcessingParameterNumber|angle|Angle of major axis in degrees|QgsProcessingParameterNumber.Double|0.0|True|0.0|360.0
QgsProcessingParameterField|column|Name of column to use for buffer distances|None|input|-1|False|True
QgsProcessingParameterNumber|scale|Scaling factor for attribute column values|QgsProcessingParameterNumber.Double|1.0|True|None|None
QgsProcessingParameterNumber|tolerance|Maximum distance between theoretical arc and polygon segments as multiple of buffer|QgsProcessingParameterNumber.Double|0.01|True|None|None
*QgsProcessingParameterBoolean|-s|Make outside corners straight|False
*QgsProcessingParameterBoolean|-c|Do not make caps at the ends of polylines|False
*QgsProcessingParameterBoolean|-t|Transfer categories and attributes|False
QgsProcessingParameterVectorDestination|output|Buffer
