Date management in custom apps

[Claire_Champourlier]

Finally start finding a solution for request bodies - same idea should apply to responses:

	"body": {
		"{{...}}": "{{omit(parameters, 'metadata', 'payer')}}",
		"payer": {
			"{{...}}": "{{omit(parameters.payer, 'dateOfBirth')}}",
			"dateOfBirth": "{{formatDate(parameters.payer.dateOfBirth, 'YYYY-MM-DD')}}"
		}
	},