mutation {
  pay(idAccount: 1,
  payment:  {
     recipients:  [{
        address: "u1p0j6xazlcmwsxq0z8rcavyx4edgrsqwc5aj4efsdxn8adc2url0eypkttd0608hfdx592jxt78ar062urudm3wctx72vg89v25zktnpp"
        amount: "0.00040157"
     }]
     srcPools: 7
  })
}

This mutation makes a payment from account 1 to the address u1p0... for an amount of 0.00040157 ZEC. The transaction can use any source of funds available regardless of the pool because of the srcPools is set at 7.

You can send to more than one recipient with the pay mutation.

Other flags are:

• recipientPaysFee: true if the transaction fee should be deducted from the amount sent out

The transaction builder will prioritize using shielded funds, but may use transparent funds if allowed by the srcPools value. To force a t2t transaction, set srcPools to 1 (See Pools).