Incorrect return type for `/authorization_code` endpoint

[rubendinho]

While the return type in the OAS document says Array, the API actually returns a single AuthorizationCodeResponse object:

openapi/openapi/mx_platform_api.yml

Lines 529 to 531 in 5be0770

	authorization_code:
	items:
	"$ref": "#/components/schemas/AuthorizationCodeResponse"

This is also what the MX docs show: https://docs.mx.com/products/connectivity/instant-account-verification/processor-token/client-guide#5-request-an-authorization-code

Because of this error, OpenAPI-generator clients are not returning data for this endpoint.