Medyo risky yan, mama, mas mabuti kung ikaw mismo ang pupunta sa mayor's office with your original documents para sa indigency cert, kasi usually sila ang tatanungin ng personal details at kailangan nila makita ang actual ID mo para ma-verify. One of my mum friends tried sending her husband with a letter before at binabalik nila, sabi ayaw nila ng representative unless may special circumstances, so better safe than sorry talaga, para hindi mawalan ng oras, pumunta ka na mismo if kaya mo, or contact the mayor's office first to ask kung okay lang talaga ang authorization letter approach bago ka mag-print and hassle.