With regard to applications of types (i) and (ii), the EPO will check that these fees have been paid. If either fee is not paid on time, the application is deemed to be withdrawn. The EPO will notify the applicant of the loss of rights according to Rule 112(1); the applicant can respond by requesting further processing according to Art. 121 and Rule 135.
With regard to Euro-PCT applications (type (iii)), see E-VIII, 2.1.3.