AI-generated Key Takeaways
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          GMSPinImageOptionsprovides customization options for the image of advanced markers on a map.
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          It allows developers to set a glyph (string or image) to replace the default marker icon. 
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          Developers can customize the marker's appearance with backgroundColorandborderColorproperties.
GMSPinImageOptions
@interface GMSPinImageOptions : NSObjectProvides pin image customization for an advanced marker.
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                  An object representing a String or Image to replace the glyph on the marker DeclarationSwift var glyph: GMSPinImageGlyph? { get set }Objective-C @property (nonatomic, nullable) GMSPinImageGlyph *glyph;
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                  The color used to fill the marker shape with. DeclarationSwift var backgroundColor: UIColor? { get set }Objective-C @property (nonatomic, nullable) UIColor *backgroundColor;
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                  The color used for the border of the marker shape. DeclarationSwift var borderColor: UIColor? { get set }Objective-C @property (nonatomic, nullable) UIColor *borderColor;