"请给我收据。"

Translation: Please give me a receipt.

[Li-Na-Mercimek]

I remember saying 发票 most of the time.

[cfdance101]

Agreed: living in Beijing, at least, 发票 is what all the taxi drivers & shops say.

[maartendoc]

收 (shōu) = to receive/to accept
据 (jù) = according to/evidence/proof
收据 (shōujù) = receipt

We learned 据 before in:
根 (gēn) = root/basis
据 (jù) = according to/to depend on
根据 (gēnjù) = according to/based on

[Robin910031]

小票 (xiao piao) is more commonly used than 收据 in casual conversations.

[m025678]

收據 ok,發票 is more commonly uesd in Taiwan.