Application verification: timelines for officer action, electronic intimation and deemed approval when officer fails to act. The proper officer must examine registration applications and approve them within a short statutory period if in order. If deficiencies arise, the officer shall electronically seek clarification in FORM GST REG-03 and the applicant must reply in FORM GST REG-04 within a prescribed response period; certain core identifiers in Part A of FORM GST REG-01 are excluded from modification. Satisfied officers may approve within a further period; unsatisfied officers must record written reasons and notify electronically in FORM GST REG-05. Failure to act within prescribed periods leads to deemed approval.