code: function parseAmpEncodedParams( value ) {
  	value = value
  		.split( '*' )
  		.filter( val => val.length )
  		.slice( 2 );
  	// return null if empty or we have an odd number of elements
  	if ( 0 === value.length || 0 !== value.length % 2 ) {
  		return null;
  	}
  	const keyValMap = {};
  	for ( let i = 0; i < value.length; i += 2 ) {
  		keyValMap[ value[ i ] ] = urlSafeBase64DecodeString( value[ i + 1 ] );
  	}
  
  	return keyValMap;
  }
docs: Decodes a URL param encoded by AMP's linker.js
  See also https://github.com/ampproject/amphtml/blob/master/extensions/amp-analytics/linker-id-receiving.md
  
  @param {String} value Value to be decoded
  @return {null|Object} null or and object containing key/value pairs