It all depends on whether they are asking for donations (petición) or selling something (oferta).

solicitation
1. To seek to obtain by persuasion, entreaty, or formal application: a candidate who solicited votes among the factory workers.
2. To petition persistently; importune: solicited the neighbors for donations.
3. To entice or incite to evil or illegal action.
4. To approach or accost (a person) with an offer of sexual services.
v.intr.
1. To make solicitation or petition for something desired.
2. To approach or accost someone with an offer of sexual services in return for payment.

Es como se diría en español (sí aunque sea confuso el uso del pronombre)
Los ejemplos abajo son expresivos