What are the limits for sending and receiving

See the following from Apple Cash and person to person payments limits - Apple Support

Sending or receiving limits

• Per message, you can send or receive a minimum of $1.
• Per message, you can send or receive up to $10,000.
• Within a 7-day period, you can send or receive a maximum of $10,000.

You might also be limited by the available balance on your debit or prepaid card or limits from your bank or card issuer.

If you're part of Apple Cash Family

• Per message, you can send or receive a minimum of $1.
• Per message, you can send or receive up to $2,000.
• Within a 7-day period, you can send or receive a maximum of $2,000.