prepareCalls

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function prepareCalls<TAccount>(client, params): Promise<
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  | {
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  chainId: `0x${string}`;
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  data: {
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     callData: `0x${string}`;
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     callGasLimit: `0x${string}`;
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     initCode: `0x${string}`;
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     maxFeePerGas: `0x${string}`;
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     maxPriorityFeePerGas: `0x${string}`;
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     nonce: `0x${string}`;
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     paymasterAndData: `0x${string}`;
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     preVerificationGas: `0x${string}`;
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     sender: `0x${string}`;
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     verificationGasLimit: `0x${string}`;
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  };
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  feePayment: {
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     maxAmount: `0x${string}`;
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     sponsored: boolean;
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     tokenAddress: `0x${string}`;
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  };
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  signatureRequest?:   | {
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     data:   | string
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        | {
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        raw: `0x${string}`;
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      };
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     rawPayload: `0x${string}`;
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     type: "personal_sign";
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   }
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     | {
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     data: {
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        domain?: {
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           chainId?: number;
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           name?: string;
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           salt?: `0x${string}`;
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           verifyingContract?: `0x${string}`;
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           version?: string;
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        };
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        message: Record<string, unknown>;
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        primaryType: string;
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        types: Record<string, object[]>;
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     };
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     rawPayload: `0x${string}`;
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     type: "eth_signTypedData_v4";
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   };
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  type: "user-operation-v060";
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}
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  | {
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  chainId: `0x${string}`;
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  data: {
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     callData: `0x${string}`;
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     callGasLimit: `0x${string}`;
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     factory?: `0x${string}`;
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     factoryData?: `0x${string}`;
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     maxFeePerGas: `0x${string}`;
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     maxPriorityFeePerGas: `0x${string}`;
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     nonce: `0x${string}`;
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     paymaster?: `0x${string}`;
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     paymasterData?: `0x${string}`;
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     paymasterPostOpGasLimit?: `0x${string}`;
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     paymasterVerificationGasLimit?: `0x${string}`;
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     preVerificationGas: `0x${string}`;
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     sender: `0x${string}`;
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     verificationGasLimit: `0x${string}`;
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  };
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  feePayment: {
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     maxAmount: `0x${string}`;
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     sponsored: boolean;
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     tokenAddress: `0x${string}`;
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  };
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  signatureRequest?:   | {
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     data:   | string
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        | {
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        raw: `0x${string}`;
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      };
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     rawPayload: `0x${string}`;
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     type: "personal_sign";
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   }
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     | {
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     data: {
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        domain?: {
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           chainId?: number;
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           name?: string;
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           salt?: `0x${string}`;
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           verifyingContract?: `0x${string}`;
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           version?: string;
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        };
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        message: Record<string, unknown>;
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        primaryType: string;
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        types: Record<string, object[]>;
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     };
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     rawPayload: `0x${string}`;
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     type: "eth_signTypedData_v4";
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   };
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  type: "user-operation-v070";
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}
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  | {
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  data: {
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     domain?: {
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        chainId?: number;
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        name?: string;
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        salt?: `0x${string}`;
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        verifyingContract?: `0x${string}`;
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        version?: string;
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     };
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     message: Record<string, unknown>;
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     primaryType: string;
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     types: Record<string, object[]>;
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  };
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  modifiedRequest: {
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     calls: object[];
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     capabilities?: {
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        eip7702Auth?:   | true
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           | {
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           account?: `0x${string}`;
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           delegation: "ModularAccountV2" | "0x69007702764179f14F51cdce752f4f775d74E139";
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         };
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        gasParamsOverride?: {
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           callGasLimit?:   | `0x${string}`
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              | {
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              multiplier: number;
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            };
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           maxFeePerGas?:   | `0x${string}`
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              | {
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              multiplier: number;
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            };
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           maxPriorityFeePerGas?:   | `0x${string}`
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              | {
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              multiplier: number;
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            };
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           paymasterPostOpGasLimit?:   | `0x${string}`
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              | {
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              multiplier: number;
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            };
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           paymasterVerificationGasLimit?:   | `0x${string}`
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              | {
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              multiplier: number;
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            };
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           preVerificationGas?:   | `0x${string}`
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              | {
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              multiplier: number;
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            };
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           verificationGasLimit?:   | `0x${string}`
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              | {
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              multiplier: number;
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            };
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        };
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        nonceOverride?: {
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           nonceKey: `0x${string}`;
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        };
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        paymasterService?: ({ policyId: string; } | { policyIds: string[]; }) & { onlyEstimation?: boolean | undefined; erc20?: { maxTokenAmount?: `0x${string}` | undefined; tokenAddress: `0x${string}`; preOpSettings: { autoPermit: { ...; }; }; } | { ...; } | { ...; } | { ...; } | undefined; webhookData?: string | undefined; };
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        permissions?:   | {
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           context: `0x${string}`;
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         }
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           | {
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           sessionId: `0x${string}`;
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           signature: `0x${string}`;
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         };
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     };
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     chainId: `0x${string}`;
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     from: `0x${string}`;
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     paymasterPermitSignature?:   | {
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        data:   | `0x${string}`
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           | {
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           r: `0x${string}`;
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           s: `0x${string}`;
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           yParity: `0x${string}`;
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         }
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           | {
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           r: `0x${string}`;
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           s: `0x${string}`;
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           v: `0x${string}`;
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         };
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        type: "secp256k1";
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      }
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        | {
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        data:   | `0x${string}`
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           | {
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           r: `0x${string}`;
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           s: `0x${string}`;
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           yParity: `0x${string}`;
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         }
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           | {
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           r: `0x${string}`;
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           s: `0x${string}`;
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           v: `0x${string}`;
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         };
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        type: "ecdsa";
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      };
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  };
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  signatureRequest: {
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     data: {
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        domain?: {
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           chainId?: number;
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           name?: string;
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           salt?: `0x${string}`;
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           verifyingContract?: `0x${string}`;
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           version?: string;
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        };
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        message: Record<string, unknown>;
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        primaryType: string;
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        types: Record<string, object[]>;
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     };
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     rawPayload: `0x${string}`;
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     type: "eth_signTypedData_v4";
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  };
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  type: "paymaster-permit";
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}
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  | {
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  data: (
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     | {
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     chainId: `0x${string}`;
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     data: {
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        callData: `0x${string}`;
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        callGasLimit: `0x${string}`;
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        initCode: `0x${string}`;
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        maxFeePerGas: `0x${string}`;
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        maxPriorityFeePerGas: `0x${string}`;
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        nonce: `0x${string}`;
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        paymasterAndData: `0x${string}`;
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        preVerificationGas: `0x${string}`;
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        sender: `0x${string}`;
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        verificationGasLimit: `0x${string}`;
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     };
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     feePayment: {
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        maxAmount: `0x${string}`;
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        sponsored: boolean;
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        tokenAddress: `0x${string}`;
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     };
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     signatureRequest?:   | {
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        data:   | string
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           | {
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           raw: `0x${(...)}`;
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         };
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        rawPayload: `0x${string}`;
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        type: "personal_sign";
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      }
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        | {
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        data: {
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           domain?: {
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              chainId?: ...;
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              name?: ...;
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              salt?: ...;
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              verifyingContract?: ...;
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              version?: ...;
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           };
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           message: Record<string, unknown>;
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           primaryType: string;
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           types: Record<string, ...[]>;
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        };
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        rawPayload: `0x${string}`;
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        type: "eth_signTypedData_v4";
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      };
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     type: "user-operation-v060";
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   }
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     | {
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     chainId: `0x${string}`;
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     data: {
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        callData: `0x${string}`;
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        callGasLimit: `0x${string}`;
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        factory?: `0x${string}`;
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        factoryData?: `0x${string}`;
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        maxFeePerGas: `0x${string}`;
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        maxPriorityFeePerGas: `0x${string}`;
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        nonce: `0x${string}`;
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        paymaster?: `0x${string}`;
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        paymasterData?: `0x${string}`;
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        paymasterPostOpGasLimit?: `0x${string}`;
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        paymasterVerificationGasLimit?: `0x${string}`;
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        preVerificationGas: `0x${string}`;
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        sender: `0x${string}`;
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        verificationGasLimit: `0x${string}`;
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     };
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     feePayment: {
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        maxAmount: `0x${string}`;
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        sponsored: boolean;
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        tokenAddress: `0x${string}`;
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     };
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     signatureRequest?:   | {
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        data:   | string
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           | {
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           raw: `0x${(...)}`;
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         };
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        rawPayload: `0x${string}`;
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        type: "personal_sign";
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      }
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        | {
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        data: {
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           domain?: {
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              chainId?: ...;
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              name?: ...;
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              salt?: ...;
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              verifyingContract?: ...;
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              version?: ...;
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           };
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           message: Record<string, unknown>;
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           primaryType: string;
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           types: Record<string, ...[]>;
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        };
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        rawPayload: `0x${string}`;
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        type: "eth_signTypedData_v4";
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      };
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     type: "user-operation-v070";
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   }
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     | {
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     chainId: `0x${string}`;
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     data: {
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        address: `0x${string}`;
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        nonce: `0x${string}`;
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     };
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     signatureRequest: {
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        rawPayload: `0x${string}`;
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        type: "eip7702Auth";
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     };
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     type: "authorization";
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  })[];
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  type: "array";
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}>;

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// Prepare a sponsored user operation call
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const result = await client.prepareCalls({
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  calls: [
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    {
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      to: "0x1234...",
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      data: "0xabcdef...",
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      value: "0x0",
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    },
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  ],
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  capabilities: {
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    paymasterService: { policyId: "your-policy-id" },
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  },
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});